In mid 2022, RKI Instruments announced the discontinuation of 03 Series (CO-03, HS-03, and OX-03) to make room for the newly released 04 Series. The GP-03, a personal combustible gas monitor, is still available! 

RKI will continue offering the GP-03 for the foreseeable future.

The GP-03 is a portable single gas monitor that is ideal for any applications that require a combustible gas sensor. 

The GP-03 continuously operates for up to 35 hours and is equipped with a 360-degree rotatable alligator clip and protective rubber boot. With a list price of $320, a two-year warranty, and an easy-to-replace sensor, the GP-03 has the best cost of ownership for any single gas combustible gas monitor.