GasAlertMicroClip measures just 4.2 ins. by 2.4 ins. by 1.4 ins. and weighs 5.6 oz. Continuous LCD shows simultaneous gas concentrations for oxygen (O2), carbon monoxide (CO), hydrogen sulphide (H2S), and combustibles (0-11% lower explosive limit/LEL or 0-.5% Methane) with one-button operation and simplified calibration. Also features standard data logger (16 hrs.), event logger (10 events), user-selectable options, and function self-test. Provides 95-dB. alarm tone with 4 alarm levels: instant low and high alarm for all gases; time-weighted average; short-term exposure limit; and over limit. Internal vibrating alarm suits high-noise areas. Lithium polymer battery gives typical 14-hr. run time and recharges in less than 3 hrs. Compatible with MicroDock II automatic test and calibration system.