RKI Instruments Equipment

Portable Single Gas Monitors

RKI Instruments

03 Series Data Sheet
03 Series Operator’s Manual

GasWatch3 Data Sheet
CO-H2 GasWatch3 Manual
CO&O2 GasWatch3 Manual
O2 GasWatch3 Manual
H2S GasWatch3 Manual
CO GasWatch3 Manual


Instrumentation Equipment

Portable Single Gas Monitors

03 Series

The 03 Series single gas monitors are designed for LEL, O2, H2S, or CO detection. Individuals need personal protection in hazardous areas at all times without adding extra bulky equipment, and the 03 Series can provide that kind of protection at an affordable price. The GP-03, OX-03, CO-03, and HS-03 models are personal single gas monitors designed for protection from exposure to combustible hydrocarbons, oxygen deficiency, hydrogen sulfide, or carbon monoxide.


The GasWatch 3 is the world’s smallest and lightest single-gas monitor. Weighing just 1.6 ounces, its compact form affords great comfort and flexibility in how you choose to wear it. It can be worn on your wrist as a watch, or clipped into your breathing zone on your lapel, hard hat or other safety equipment with its alligator clip.

The 5 different GasWatch 3 models can protect you from oxygen deficiency [GW-3(O2)], exposure to carbon monoxide [GW-3(CO)] or exposure to hydrogen sulfide [GW-3(H2S)]. A hydrogen compensated model [GW-3(C-)] can protect those who work in steel mills, refineries or other environments where hydrogen is present from carbon monoxide exposure. The dual sensor model [GW-3(CX)] can simultaneously protect you from oxygen deficiency and carbon monoxide exposure.

Reach out to a sales engineer to help find the right product for your application!




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P.O. Box 397
W166 N11965 Fond du Lac Ave.
Germantown, WI 53022