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The pHotoFlex line of colorimeters is the newest addition to YSI's full range of colorimeters. These rugged, waterproof, multiparameter colorimeters are ideal for laboratory and field testing.

Receive 20 free packets of DPD Free Chlorine or DPD Total Chlorine! Get your free samples.


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The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters.
 

Selecting the desired test has never been easier.


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The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters.
 

Selecting the desired test has never been easier.


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The YSI 900 Free and Total chlorine colorimeter is ideal for any application. This portable instrument allows you to easily take readings directly in the field or lab.
 

The 900 colorimeter is a rugged, waterproof, single parameter instrument for the measurement of Total chlorine or Free chlorine.


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Waterproof, accurate, easy to use colorimeter

The YSI 910 COD colorimeter is ideal for any application. This portable instrument allows you to easily take readings for COD.

A thermoreactor, such as the CR 2200, CR 3200, or CR 4200, is required to complete the COD tests.


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COD thermoreactor for up to 2 different temperature blocks with 12 test tubes each.
Thermoreactor for COD and thermal digestions, 2 different temperature blocks for up to 12 reaction cuvettes each, 8 user defined/8 fixed programs, selectable temperature. 115 V version. Thermoreactor for COD
COD thermoreactor for up to 24 test tubes.

Thermoreactor for COD and thermal digestions, up to 24 reaction cuvettes, 8 user defined/8 fixed programs, selectable temperature. 115 V version. COD thermoreactor for up to 24 test tubes
COD thermoreactor for up to 12 test tubes.

Thermoreactor for COD and thermal digestions for up to 12 test tubes, with 3 reactors temperatures and 8 fixed programs. 115 V version. Model # CR 2200 Part #1P21-2Y Used in conjunction with the 910 COD or pHotoFlex colorimeters.
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