Suits the RPB GX4 Gas Monitor GX4 can simaltaneously monitor 4 different gasses Replacement cartridge come sealed and are factory calibrated for easy in-field installation Allows you to replace your sensors and be up to date without having to send your monitor into the factory for servicing. Sensors have an expected life of 2 years from date of manufacture (unless prematurely fouled) Detects CO Carbon Monoxide, H2S Hydrogen Sulfide or O2 Oxygen giving you complete confidence in your breathing air Genuine Parts – Manufactured by RPB Safety
