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Wearable, lightweight detectors can monitor up to four atmospheric hazards (combustible gas, O2, CO, and H2S) simultaneously. Precalibrated electrochemical sensors and a catalytic sensor provide precise and reliable measurements. Audible, visual, and vibrating alarms alert the user when a hazardous level of gas is present. Three-button operation and intuitive menu are easy to use, and a large display continuously shows the level of the gas measured. Rugged, water-resistant polymer housing is resistant to bumps, drops, and many corrosive chemicals. The optional internal pump can be used with up to 20m (66') of tubing and is ideal for confined space applications. Enclosure rating: IP 65. UL listed. CSA certified. CE marked. MSHA and ATEX approved. Ambient Conditions, Temperature Range: -20 to 55 degrees C (-5 to 130 degrees F) continuous -40 to 55 degrees C (-40 to 130 degrees F) short term Pressure Range: 700-1300 hPa (20.7-38.4 in. Hg) Humidity Range: 10 to 95% RH Audible Alarm: 90 dB at a distance of 30 cm (12") Battery Life, Diffusion: 24 hrs. Alkaline, 18 hrs. NiMH With Pump: 12 hrs. Alkaline, 12 hrs. NiMH Charging Time: 4 hrs. Dimensions: 89H x 140W x 55D mm (31/2 x 51/2 x 23/16") Unit Weight: 550 g (19.4 oz.) Ordering Information: All monitors include noted sensors, NiMH battery, battery charger, service tool, calibration adapter, instruction manuals, and a two-year manufacturer's warranty. In addition, monitors with internal pumps (80082-520, -518, and -516) also include pump adapter, 3m (10') Tygon tubing, and water-stop filter. Monitors with confined space kits (80082-514, -512, and -510) also include internal pump, calibration and pump adapters, 3m (10') tubing, water-stop filter, calibration gas cylinder, regulator, rubber boot, and carrying case. Internal data logger (80082-564) is factory installed and must be specified when ordering.