The Toxi Vision EX from Biosystems is a fully serviceable single channel combustible gas detector with real-time gas reading, max readings for the current operating session and customizable alarms. Available in either Alkaline or NiMH rechargeable versions, the unit features one-button operation, large backlit display, calibration adapter and convenient belt clip. Biosystems, Bacou-Dalloz, Middletown, CT.