Four gas detector. Sampling method: diffusion sampling, standard hand aspirator or motorised pump optional. Display: digital LCD displays all four gases simultaneously, with auto backlight. Alarm method: gas alarms: 1st and 2nd (user adjustable), STEL, TWA and OVER. Trouble alarms: sensor connection, low battery, low flow, circuit trouble and calibration error.
Operating temp. & humidity: -20°C ~ +50°C, 0 to 95% RH, non-condensing (splash resistant). Response time: within 30 seconds. Power source: direct charging NiMH batteries, set of 2. Dimensions and weight: 2.7 x 3 x 1 inches, 4.6 ounces.