Tetra is a 1-4 gas, single button operated, multigas monitor with top mount display and optional internal pump. 

Featuring intelligent sensor modules, shockproof constructions, top mount display and self-checking software.

Tetra is a robust and reliable monitor designed to withstand the harshest of industrial environments featuring data and event logging as standard; and audible, visual and integral vibrating alarms built into a simple to use, shockproof monitor.