The GX-3R is the world’s smallest 4-gas monitor, weighing only 3.52 ounces and can comfortably be clipped within a worker’s breathing zone. It simultaneously monitors and displays LEL combustibles, O2, CO (H2 compensated CO also available), and H2S. It represents the latest evolution of gas detection technology utilizing a new generation of microsensor technology. Sensor Improvements LEL sensor has a unique design with two active filaments in one sensor to increase its resistance to silicone poisoning – a common problem with other previous sensors. NEW O2 sensor is electrochemical with a 3 to 5-year life span. H2S and CO are now available in a combo microsensor. Features: Smallest & lightest 4 gas monitor Simultaneous detection of 4 gases (LEL, O2, H2S & CO; H2) Compensated CO sensor available) Simple 2-button operation Non-Compliance Indicator Alarms: audible, visual, & vibration 3 user-adjustable alarm levels Impact-resistant body with removable rubber boot Large LCD Auto-backlit display 25 hours of operation (Lithium-ion battery) Field replaceable sensors & filters Water and dust resistant design, IP66/68 3 Year warranty Specifications: Dimensions: 2.2 W x 2.55 H x 1.02 D inches (H 200 x W 68 x D 52 mm) Weight: 3.52 ounces Alarm Types: Gas alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing Trouble: Sensor disconnection, low battery, a circuit error, a calibration range error Sample Method: Diffusion sampling standard (hand aspirator or clip-on motorized pump optional) Response Time: Within 30 Seconds (T90) Display: Digital LCD displays with 7 segments plus 14 segments plus icon Audible Alarm: Gas Alarm 100 dB @ 30 cm; Trouble Alarm 95 dB @ 30cm Power Source: Lithium-ion battery, Approx. 25 hours after a 3-hour full charge Operating Temperature: -20°C to +50°C (-4°F to +122°F ) Relative Humidity: 10 t0 90% RH non-condensing Warranty: Three-year material (including sensors) and workmanship