1. 2010
Catalog
®
Turbidity Standards &
Instrumentation
High quality, EPA Approved Standards
• Non-Toxic
• NIST—Traceable
• No dilutions or mixing

2. Page 2 To Order Call: 1-800-858-9682
Creating Solutions for Chemists for over 80 Years!
GFS Chemicals Customer Service Guarantee:
Major credit cards accepted: MasterCard, Visa, American Express
Convenient hours: Monday to Friday, 8am to 5:30pm EST
Order by phone, fax, or e-mail
Personalized service -- You'll like our people!
Technical assistance readily available
Order online at www.gfschemicals.com!
PO Box 245
Powell, OH 43065
www.amcoclear.com
www.turbidimeter.net
www.gfschemicals.com
Phone (U.S. and Canada): 800.858.9682
Phone (International): 740.881.5501
Fax: 740.881.5989

3. GFS Chemicals Inc Page 3
Table of Contents
Introduction 4
Amco Clear® Basics 5
Individual Turbidity Standards 6
Haze Standards 11
Total Suspended Solid Standards 11
Turbidity Kits 12
Instrumentation 20
McVan Analite® 21
Emerson-Rosemount 24
Campbell Scientific 24
In-Spec® Spectrophotometer Standards 25
Analytical Lab Reagents 26

4. Page 4 To Order Call: 1-800-858-9682
Introduction
GFS Chemicals Inc - Reliable Chemical Manufacturing for over 80
Years!
Since we started manufacturing specialty chemicals in 1928 as The
G. Frederick Smith Chemical Company, customers have learned to
rely on GFS for many good rea-
sons:
Our original focus on
ligands and reagents
needed in analytical chem-
istry protocols gave us a
broad understanding of the
quality control issues that
impact your lab and busi-
ness decisions
Our seminal development of chemistry of perchloric acid and per-
chlorate salts spawned a tradition of engineering excellence and
emphasis on safety that applies to all of GFS Chemical’s manu-
facturing.
Our ability to actually manufacture reagents across the entire
chemical spectrum.
GFS Chemicals added the Amco Clear® and In-Spec® lines to its prod-
uct catalog in 2003 with the purchase of the APS Analytical Stan-
dards. Since this time GFS
Chemicals has used its 80 years
experience in manufacturing
analytical lab reagents to further
expand and improve on the prod-
ucts that we offer in the Amco
Clear® and In-Spec® product
lines. The Amco Clear® product
line now includes standards for
most of today’s common instru-
ments. R&D work is always on going to bring out new products.

5. GFS Chemicals Inc Page 5
Amco Clear® Basics
Amco Clear® has several advantages over formazin-based standards.
A typical mean particle diameter of 0.2 micron ensures consistent
light scattering characteristics, and provides the advantage of perma-
nent suspension. The GFS turbidity standards are significantly more
stable and, unlike formazin-based standards, can be used for calibra-
tion under one nephelometric unit (NTU). This is important because
the EPA requires turbidity values not to exceed 0.30 NTU for surface
source drinking water. GFS maintains the strictest standards of ISO-
9001:2008 conformance.
Advantages
Lot to lot accuracy of 1%
NIST Traceable
Stable - a uniform suspension and consistent value
Easy-to-use - No Mixing and no dilution required
Non-Toxic - No concerns over handling, liability, storage and dis-
posal
Available in a wide range of values
Amco Clear Guarantee
The primary standards are guaranteed to be within 1% of the
stated value on the Certificate of Analysis for 1 year from the date
of shipment.
The secondary standards are guaranteed to be within 10% of the
stated value on the Certificate of Analysis for 1 year from the date
of shipment.
Precautions for handling and using the Amco Clear ® Standards
Do not allow the standards to freeze or be exposed to
extreme heat.
The standards are ready to use—do not require shaking.
Replace caps promptly on primary standards.
Use a cuvette stand or other glass holder to keep sealed
standards

6. Page 6 To Order Call: 1-800-858-9682
Individual Turbidity Standards
GFS Chemicals Inc offers the Amco Clear® primary turbidity standards in
125mL, 250mL, 500mL, 1L and 1 gallon bottles (some standards may not be
available in all sizes). The standards are made instrument specific so instru-
ment make and model must be known in order to verify that the proper stan-
dards are being provided.
Secondary sealed standards may also be offered for use as a daily instrument
calibration verification.
A list is provided on the following pages of the most popular instruments for
which we provide standards. This is not a complete list of all turbidimeters on
the market. If you do not see your instrument listed please contact GFS
Chemicals Inc and we will work with you to provide you the correct standards.
Item #8000—0.0NTU can work for all instruments and can be used when a
0.02NTU standard is required by the instrument manufacturer.

7. GFS Chemicals Inc Page 7
Individual Turbidity Standards
Rosemount Analytical Hach
Clarity II™ - US EPA 180.1 Hach 2100 N and AN (cont.)
#8411—20.0NTU Standard #8109—1000.0NTU Standard
#8110—4000.0NTU Standard
Clarity II™ - ISO 7027 #8356—7500.0NTU Standard
#8412—20.0FNU Standard
Hach 2100 AN IS
FTS #8147—100NTU Standard
#8286—200NTU Standard
#8148—1000NTU Standard
DTS 12 #8032—4000NTU Standard
#8428—125TU Standard #8464—7500NTU Standard
#8429—250TU Standard
#8430—500TU Standard Hach 2100P
#8431—1000TU Standard #8115—0.5NTU Standard
#8432—2000TU Standard #8124—5.0NTU Standard
#8433—4000TU Standard #8111—10.0NTU Standard
#8112—20.0NTU Standard
GLI #8113—100.0NTU Standard
#8114—800.0NTU Standard
Accu 4™
Hach 2100Q
#8017—40.0NTU Standard
#8534—10NTU Standard
#8535—20NTU Standard
Hach #8536—100NTU Standard
#8537—800NTU Standard
1720 (C/D/E)
#8289—1.0NTU Standard Hach 2100 Q IS
#8050—20.0NTU Standard #8538—10NTU Standard
#8539—20NTU Standard
2100 N and AN #8540—100NTU Standard
#8098—0.1NTU Standard #8541—800NTU Standard
#8127—0.2NTU Standard
#8129—0.3NTU Standard Hach 18900 Ratio
#8106—0.5NTU Standard #8034—0.8NTU Standard
#8067—1.0NTU Standard #8035—1.8NTU Standard
#8099—2.0NTU Standard #8037—18NTU Standard
#8100—5.0NTU Standard #8039—180NTU Standard
#8145—10.0NTU Standard
#8107—20.0NTU Standard
#8108—200.0NTU Standard

8. Page 8 To Order Call: 1-800-858-9682
Individual Turbidity Standards
Hach HF Scientific
Hach 2000/43900 XR™ Ratio
#8035—1.8NTU Standard Micro 1000 WL
#8037—18NTU Standard #8014—10NTU Standard
#8104—180NTU Standard #8021—100NTU Standard
#8041—1800NTU Standard #8079—1750NTU Standard
Hach FilterTrak 660™ Micro 100 IR
#8001—0.1NTU Standard #8076—10NTU Standard
#8362—0.3NTU Standard #8078—1000NTU Standard
#8006—0.8NTU Standard
Micro 1000 IR
Hach Surface Scatter 6™ #8076—10NTU Standard
#8249—200.0NTU Standard #8077—100NTU Standard
#8359—1750NTU Standard
Hanna Micro TPW
#8014—10NTU Standard
HI 93703 #8030—1000NTU Standard
#8125—10.0NTU Standard
#8132—500.0NTU Standard Micro TPI
#8076—10NTU Standard
LP2000 #8077—100NTU Standard
#8125—10.0NTU Standard #8078—1000NTU Standard
#8132—500.0NTU Standard
Micro TOL 2 WL
HF Scientific #8014—10NTU Standard
#8030—1000NTU Standard
DRT 100B Micro TOL 3 WL
#8068—0.8NTU Standard #8014—10NTU Standard
#8036—8.0NTU Standard #8021—100NTU Standard
#8038—80.0NTU Standard
#8040—800.0NTU Standard Micro TOL 4 WL
#8014—10NTU Standard
DRT 15CE #8030—1000NTU Standard
#8014—10.0NTU Standard
#8021—100NTU Standard Micro TOL 2 IR
#8030—1000NTU Standard #8076—10NTU Standard
#8078—1000NTU Standard
Micro 100 WL
#8014—10NTU Standard
#8030—1000NTU Standard

9. GFS Chemicals Inc Page 9
Individual Turbidity Standards
HF Scientific In-Situ Inc.
Micro TOL 3 IR Troll® 9000
#8076—10NTU Standard #8485—10NTU Standard
#8077—100NTU Standard #8486—100NTU Standard
#8487—1000NTU Standard
Micro TOL 4 IR #8488—1800NTU Standard
#8076—10NTU Standard
#8078—1000NTU Standard
Lamotte
Horiba 2020
#8180—1.0NTU Standard
U-10 #8184—10NTU Standard
#8524—10NTU Standard #8186—100NTU Standard
#8525—100NTU Standard
#8626—800NTU Standard 2020e / TC3000e
#8335—1.0NTU Standard
U/W-22 #8336—10NTU Standard
#8515—10NTU Standard #8482—1000NTU Standard
#8516—100NTU Standard
#8517—800NTU Standard 2020i / TC3000i
#8338—1.0NTU Standard
U-52 #8339—10NTU Standard
#8521—10NTU Standard
#8522—100NTU Standard
#8523—800NTU Standard
ICM
#8004—0.5NTU Standard
U-53 #8014—10NTU Standard
#8518—10NTU Standard
#8519—100NTU Standard
#8520—800NTU Standard
McVan Analite®
NEP 180
Hydrolab #8427—400NTU Standard
#8176—50NTU Standard #8360—1000NTU Standard
#8177—100NTU Standard #8361—4000NTU Standard

10. Page 10 To Order Call: 1-800-858-9682
Individual Turbidity Standards
McVan Analite® McVan Analite®
NEP 260 NEP 9000 Series
#8117—10NTU Standard #8117—10NTU Standard
#8120—40NTU Standard #8120—40NTU Standard
#8410—50NTU Standard #8410—50NTU Standard
#8188—100NTU Standard #8188—100NTU Standard
#8121—400NTU Standard #8121—400NTU Standard
#8189—800NTU Standard #8189—800NTU Standard
#8122—1000NTU Standard #8122—1000NTU Standard
#8456—3000NTU Standard #8456—3000NTU Standard
NEP 280
#8427—400NTU Standard
Monitek
#8360—1000NTU Standard
#8361—4000NTU Standard TA1
#8007—1.0NTU Standard
NEP 285 #8014—10NTU Standard
#8427—400NTU Standard #8021—100NTU Standard
#8360—1000NTU Standard
#8361—4000NTU Standard OBS
NEP 390 Series
#8428—125TU Standard
#8117—10NTU Standard
#8429—250TU Standard
#8120—40NTU Standard
#8430—500TU Standard
#8410—50NTU Standard
#8431—1000TU Standard
#8188—100NTU Standard
#8432—2000TU Standard
#8121—400NTU Standard
#8433—4000TU Standard
#8189—800NTU Standard
#8122—1000NTU Standard
#8456—3000NTU Standard Orbeco Hellige
NEP 495 #8017—40NTU Standard
#8117—10NTU Standard
#8120—40NTU Standard
#8410—50NTU Standard Turner
#8188—100NTU Standard
#8121—400NTU Standard AquaFluor
#8189—800NTU Standard #8545—10NTU Standard
#8122—1000NTU Standard #8546—100NTU Standard
#8456—3000NTU Standard

11. GFS Chemicals Inc Page 11
Individual Turbidity Standards
Turner
C3
#8502—10NTU Standard
#8503—100NTU Standard
Trilogy
#8502—10NTU Standard
#8503—100NTU Standard
Thermo Electron
AQ4500
#8052—1NTU Standard
#8054—10NTU Standard
#8056—100NTU Standard
#8058—1000NTU Standard
Haze Standards
GFS Chemicals Inc manufactures a series of Haze standards for use in the
brewing industry. Below is a list of our stock standards. Please give us a call
to discuss your application.
#8042—0.5 EBC
#8043—1.0 EBC
#8044—2.5 EBC
#8046—5.0 EBC
#8045—10 EBC
#8047—25 EBC
Total Suspended Solids (TSS)
GFS Chemicals Inc now manufactures TSS Standards for the Wastewater
Treatment Industry. Please contact the Amco Clear Product Manager to dis-
cuss your application. These standards are for use in gravimetric determina-
tion of total suspended solids.

12. Page 12 To Order Call: 1-800-858-9682
Turbidity Kits
Primary Standard Kit
-The primary kit consists of bottled standards in values determined
by the manufacturer’s recommended calibration points.
Secondary Standard Kit
-The secondary standard kit consists of sealed glass vials designed
to verify calibration.
Deluxe Standard Kit
-The deluxe kit consists of both the primary standards and the sec-
ondary sealed standards that allow you to calibrate and verify your instrument
at the manufacturer’s suggested calibration points.

13. GFS Chemicals Inc Page 13
Turbidity Kits (listed by instrument)
Hach
1720 C/D/E
#8247—Hach 1720 C/D/E—Full Range
- contains 0.0 NTU and 20 NTU standards
-SKU # 85558—Liter Kit
-SKU # 85559—Gallon Kit
#8271—Hach 1720 C/D/E—Low Range
- contains 0.0 NTU and 1.0 NTU standards
-SKU # 86340—Liter Kit
-SKU # 86307—Gallon Kit
2100 N/AN
#8215—Hach 2100 N/AN
- contains 0.0, 20, 200, 1000, and 4000 NTU standards
-SKU #85525—Primary Kit
-SKU #85405—Secondary Kit
-SKU #85551—Deluxe Kit
2100 N IS/AN IS
#8195—Hach 2100 N IS/AN IS
- contains 0.0, 20, 200, 1000, and 4000 NTU standards
-SKU #86096—Primary Kit
-SKU #86517—Secondary Kit
-SKU #86097—Deluxe Kit
2100 P
#8216—Hach 2100 P
- contains 0.0, 20, 100, and 800 NTU standards
-SKU #85526—Primary Kit
-SKU #85407—Secondary Kit
-SKU #85552—Deluxe Kit
2100 Q
#8542—Hach 2100 Q WL
- contains 0.0, 20, 100, and 800 NTU standards
-SKU #85712—Primary Kit
-SKU #85713—Deluxe Kit

14. Page 14 To Order Call: 1-800-858-9682
Turbidity Kits
Hach (continued)
Hach 2100 Q IS
#8543—Hach 2100 Q IS
- contains 0.0, 20, 100, and 800 NTU standards
-SKU #85714—Primary Kit
-SKU #85716—Deluxe Kit
Filter Track 660™
#8279—Hach Filter Track 660™
- contains 0.0 and 0.8 NTU standards
-SKU #86341—Liter Kit
-SKU #86342—Gallon Kit
18900 Ratio
#8212—Hach 18900 Ratio
- contains 1.8, 18, and 180 NTU standards
-SKU #85522—Primary Kit
-SKU #85395—Secondary Kit
-SKU #85548—Deluxe Kit
Ratio / XR™ / Ratio 2000
#8213—Hach Ratio/XR™/ and Ratio 2000—lower ranges
- contains 1.8, 18, and 180 NTU standards
-SKU #85523—Primary Kit
-SKU #86518—Secondary Kit
-SKU #85549—Deluxe Kit
#8214—Hach Ratio/XR™/ and Ratio 2000—full range
- contains 1.8, 18, 180, and 1800 NTU standards
-SKU #85524—Primary Kit
-SKU #85411—Secondary Kit
-SKU #85550—Deluxe Kit
Hydrolab
Hydrolab Instruments
#8215—Hydrolab
- contains 50 and 100 NTU standards
-SKU #85563—1 L kit

15. GFS Chemicals Inc Page 15
Turbidity Kits
Hanna
C102 & C114
#8200—Hanna EPA 180.1 instruments
- contains 0.0 and 20 NTU standards
-SKU #86098—Primary Kit
-SKU #86099—Deluxe Kit
HI 93703 & LP 2000
#8246—Hanna ISO 7027 instruments
- contains 0.0 and 10 NTU standards
-SKU #86100—Primary Kit
-SKU #86184—Deluxe Kit
HF Scientific
DRT 100B
#8217—HF DRT100B—low range
- contains 0.8, 8.0, and 80 NTU standards
-SKU #85430—Primary Kit
-SKU #85553—Deluxe Kit
#8218—HF DRT100B—full range
- contains 0.8, 8.0, 80, and 800 NTU standards
-SKU #85528—Primary Kit
-SKU #85554—Deluxe Kit
DRT 15CE
#8265—HF DRT15CE
- contains 0.0, 10, 100, and 1000 NTU standards
-SKU #86169—Primary Kit
-SKU #86170—Deluxe Kit
Micro 100
#8219—HF Micro 100
- contains 0.0, 10, and 1000 NTU standards
-SKU #85529—Primary Kit
-SKU #85555—Deluxe Kit

16. Page 16 To Order Call: 1-800-858-9682
Turbidity Kits
HF Scientific (continued)
Micro 100 IR
#8220—HF Micro 100 IR
- contains 0.0, 10, and 1000 NTU standards
-SKU #85530—Primary Kit
-SKU #85556—Deluxe Kit
Micro 1000 White Light
#8268—HF Micro 1000 White Light
- contains 0.0, 10, 100, and 1750 NTU standards
-SKU #85431—Primary Kit
-SKU #86186—Deluxe Kit
Micro 1000 IR
#8221—HF Micro 1000 IR
- contains 0.0, 10, 100, and 1750 NTU standards
-SKU #85531—Primary Kit
-SKU #85557—Deluxe Kit
Micro TOL 3
#8276—HF Micro TOL 3
- contains 0.0, 10, and 100 NTU standards
-SKU #86327—Primary Kit
-SKU #86328—Deluxe Kit
Micro TPI
#8275—HF Micro TPI
- contains 0.0, 10, 100, and 1000 NTU standards
-SKU #86325—Primary Kit
-SKU #86326—Deluxe Kit
Micro TPW
#8252—HF Micro TPW
- contains 0.0, 10, and 1000 NTU standards
-SKU #86220—Primary Kit
-SKU #86226—Deluxe Kit

17. GFS Chemicals Inc Page 17
Turbidity Kits
ICM
ICM Turbidimeters
#8206—ICM
- contains 0.5 and 10 NTU standards
-SKU #85516—Primary Kit
-SKU #85544—Deluxe Kit
Lamotte
2020
#8204—Lamotte 2020
- contains 1.0 and 10 NTU standards
-SKU #85514—Primary Kit
-SKU #85539—Deluxe Kit
2020e
#8484—Lamotte 2020e
- contains 1.0 and 10 NTU standards
-SKU #86700—Primary Kit
-SKU #86701—Deluxe Kit
Monitek
Monitek TA1
#8207—Monitek TA1—Low Range
- contains 0.5 and 10 NTU standards
-SKU #85516—Primary Kit
-SKU #85544—Deluxe Kit
#8208—Monitek TA1
- contains 1.0, 10, and 100 NTU standards
-SKU #85518—Primary Kit
-SKU #86519—Secondary Kit
-SKU #85547—Deluxe Kit

18. Page 18 To Order Call: 1-800-858-9682
Turbidity Kits
Orbeco-Hellige
Orbeco Hellige Instruments
#8211—Orbeco Hellige
- contains 0.0 and 40 NTU standards
-SKU #85521—Primary Kit
-SKU #85545—Deluxe Kit
Emerson Rosemount
Clarity II™
#8417—Clarity II™ EPA 180.1
- contains 0.0 and 20 NTU standards
-SKU #86568—1 L Kit
-SKU #86569—1 Gallon Kit
#8418—Clarity II™ ISO 7027
- contains 0.0 and 20 FNU standards
-SKU #86570—1 L Kit
-SKU #86573—1 Gallon Kit
_________________________________________________________________
Hach 1720 C/D/E Full Range Kit

19. GFS Chemicals Inc Page 19
Turbidity Kits
Linearity Kits
#8254— contains 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 NTU standards
-SKU #85566—125mL Kit
-SKU #85465—250mL Kit
-SKU #85466—500mL Kit
#8255— contains 0, 2, 4, 6, 8, and 10 NTU standards
-SKU #85567—125mL Kit
-SKU #85468—250mL Kit
#8256— contains 0, 20, 40, 60, 80, and 100 NTU standards
-SKU #85568—125mL Kit
#8257— contains 0.0, 0.1, and 0.2 NTU standards
-SKU #85569—125mL Kit
#8272—Linear Verification Kit for Hach 2100 N / AN / IS
- contains 0.0, 0.2, 0.4, 0.6, and 0.8 NTU standards
-SKU #86308—60mL Kit
#8273—Linear Verification Kit for Hach 2100 P
- contains 0.0, 0.2, 0.4, 0.6, and 0.8 NTU standards
-SKU #86311—60mL Kit
Wavelength Kits
#8259—Wavelength Certification Kit
- contains one bottle of 40NTU primary standard and one bottle of
400NTU formazin solution. Can be used for all meters except Hach 18900,
Ratio XR, and Ratio 2000. Formazin must be used within 30 days.
-SKU #85572—125mL Kit

20. Page 20 To Order Call: 1-800-858-9682
Instrumentation
The right Turbidimeters and Testing Equipment for your application!
We can help you select the right instrumentation for your application. We
carry a complete line of portable, benchtop, and on-line instruments from the
following manufactures:
McVan Instruments
Lamotte
Hanna Instruments
Rosemount Analytical
Campbell Scientific
For more detailed information visit www.turbidimeter.net
*Not an all inclusive listing. Please contact GFS Chemicals if you don’t see
something for your application.

21. GFS Chemicals Inc Page 21
McVan Analite® Probes
NEP 160
The NEP 160 is a portable display unit for use with NEP 260, NEP 280, and
NEP 285. The three types of probes are ’hot swappable’ with the display unit.
NEP 160 Display Unit w/ NEP 260 Probe
NEP 260
The NEP 260 is an ISO 7027 compliant probe. It can read in solution from
0—3,000NTU. For use with the NEP 160 Display Unit
NEP 280
The NEP 280 is a retro-scatter instrument and is capable of reading from 0—
30,000NTU. For use with the NEP 160 Display Unit
NEP 285
The NEP285 is a high-temperature rated retro-scatter instrument and is capa-
ble of reading from 0—30,000NTU. For use with the NEP 160 Display Unit

22. Page 22 To Order Call: 1-800-858-9682
McVan Analite® Probes
NEP 9000 and NEP 9500 series
The NEP 9000 and 9500 series are available in standard ranges of 100NTU,
400NTU and 1,000NTU but can have a custom range up to 3,000NTU. The
NEP9000 series does not include a built in wiper but the NEP9500 wiper
assembly allows placement where fouling is likely. Both series comply with
ISO 7027.
NEP 390 series
The NEP 390 series has the ability to read turbidity up to 1,000NTU (3,000
NTU is available) and is available in the ranges of 40NTU, 100NTU, 400NTU,
and 1,000NTU which can be se by the user. The NEP 395 and NEP 396 in-
clude an integrated wiper assembly while the NEP 390 and NEP 391 do not.
The probes comply with ISO 7027.

23. GFS Chemicals Inc Page 23
McVan Analite® Probes
NEP 495 Turbidity & Temperature Logging Probe
The NEP 495 is a self contained probe that can monitor and log turbidity and
temperature. It has the ability to read up to 1,000NTU (3,000NTU is avail-
able). It can be set to the ranges of 40NTU, 100NTU, 400NTU, and
1,000NTU. It also has an integrated wiper assembly and an RS232 connec-
tion. The probe complies with ISO 7027.
TM5
The TM5 is a control unit that is ideal for use with the NEP 9500 series
probes. It can be used in a wide range of applications including industrial
process monitoring, water filtration efficiency, and monitoring of water stor-
age bodies.

24. Page 24 To Order Call: 1-800-858-9682
Emerson Rosemount
Rosemount Clarity II™
The Clarity II™ turbidimeter is in-
tended for the determination of tur-
bidity in water. Low stray light, high
stability, efficient bubble rejection,
and a display resolution of 0.001
NTU make Clarity II™ ideal for moni-
toring the turbidity of filtered drink-
ing water. Because it measures tur-
bidity as high as 200 NTU, Clarity II™
is also suitable for most raw waters.
The Clarity II™ turbidimeter can be
used in applications other than
drinking water treatment. Examples
are monitoring wastewater dis-
charges, condensate returns, and
clarifiers.
Campbell Scientific
GFS Chemicals offers the Campbell Scientific
CR1000 and CR200 series data logging sys-
tems for use with the McVan Analite brand of
turbidity sensors. The CR200 series works
well with the NEP390 series sensors and the
CR1000 works well with the NEP9000 series.
Please contact GFS Chemicals for more infor-
mation about your particular application.
CR1000
CR200

25. GFS Chemicals Inc Page 25
In-Spec® Spectrophotometer Standards
In-Spec® photometric standards are well suited for regular determination of
the photometric accuracy of a spectrophotometer. Other, alternative stan-
dards consist of filters and various dilutions of potassium dichromate and
potassium hydrogen phthalate (KHP). In-Spec® photometric standards require
no dilution, preparation or special storage conditions, eliminating user vari-
ance. In-Spec® photometric standards are guaranteed to provide a quick and
easy method of validating a spectrophotometer or colorimeter.
Advantages
Accurate
NIST Traceable
Stable - a consistent suspension
Easy-to-use - No Mixing and no dilu-
tion required
Non-Toxic - No concerns over han-
dling, liability, storage and disposal
Flexible - Use at multiple wave-
lengths specific to your current
testing
Uses
Validate absorbance between instrument calibrations
Validate instrument linearity at a single wavelength
Disinfectant Byproducts Testing via Specific UV Absorption (SUVA)
In-Spec® photometric standards are a NIST traceable liquid standard for use
in UV/Vis spectrophotometers and colorimeters. In-Spec® photometric stan-
dards can be used to determine linearity & accuracy in the UV/Vis range of
200-900nm. The In-Spec® photometric standards are composed of sub-
micron polymer spheres that will not settle out and provide stable readings
over a one-year period.
The In-Spec® product line also consists of wavelength and stray light stan-
dards that you can use to check the complete health of your spectrophotome-
ter.

26. Page 26 To Order Call: 1-800-858-9682
Analytical Lab Reagents
pH Reference Buffers
Manufactured from the finest reagent grade chemicals and high-
purity water. They are standardized at 25 o C against NIST reference
materials to a tolerance of 0.01 on buffers 4.00, 7.00, and 10.00 and
0.02 on all other buffer ranges.
Available in many sizes and cases!
High Purity Acids
GFS began manufacturing High Purity Acids in 1956. We have sev-
eral grades available including Reagent, ACS Superior, Veritas ® Redis-
tilled, Environmental, and Veritas® Double Distilled

27. GFS Chemicals Inc Page 27
Analytical Lab Reagents
AA/ICP Standards
GFS manufactures AA & ICP standards as single-element, multi-
element, and standard reference sets. Custom standards are avail-
able.
Conductivity Standards and other Analytical Products
GFS Chemicals offers a wide range of conductivity standards. Please
contact us with the values you are looking for and we can provide you
a quote for your specific standards. GFS Chemicals manufactures
many other chemicals also. For a complete listing please visit :
www.gfschemicals.com

28. PO Box 245
Powell, OH 43065