Excellent Performance In An Ergonomic, Rugged Design. Heated Diode Sensor Meets Current Sae Standards For Sensitivity. Find Leaks Better Than 0.1- oz./Yr. Water-Blocking Filter Adds A Strong Layer Of Protection For The Advanced Heated Diode Sensor. Visual/Audible Alarms Trigger On CFCs, HFCs, HCFCs and Blends. Automatic or Manual Calibration For Testing In Contaminated Environments. Features: Three Sensitivity Levels; Non-Conductive Sensor Arm; Rechargeable, User-Replaceable 15-Hour Lithium-Ion Battery; Mute Button; % Battery Charge Check; and Magnetic Hanger.