â·ÃÊͺ¶ÒÁÃÒ¤Ò Built for detecting the presence of all common refrigerants and ideal for use with air-conditioning units and cooling systems, the Extech RD300 is a must-have for any refrigerant application. RD300 Refrigerant Leakage Detector Features: Detects all standard refrigerants using a heated diode sensor LED light at probe tip (with on/off switch) for working in dimly lit areas LEDs display user-selectable High/Medium/Low levels with sensitivity of 0.25/0.50/0.99 oz per year Audible and Visual alert with mute button Low battery indicator Field replaceable sensor and LED light tip Complete with leak test bottle, 9V battery, and protective hard carrying case Detecable Refrigerants R-22, R-134a, R-404a, R-410a, all CFCs, all HCFCs and HFCs Sensor Heated Diode Sensitivity Levels High: 0.25oz/yr (7g/yr) Medium: 0.5oz/yr (14g/yr) Low: 0.99oz/yr (28g/yr) Warm Up Time 90 seconds Auto Power OFF Automatic shut off after 10 minutes Low Battery Indication LOW-BATT light switches ON Power Supply 9V Battery Battery Life 13 hours of continuous use Operating Conditions 0 to 50°C (32 to 122°F) <80%RH Storage Conditions -10 to 60°C (14 to 140°F) <70% RH Flexible Probe Length 450mm (18") Dimensions 184 x 70 x 40mm (7.2" x 2.8" x 1.6") Weight 280g (10.0oz) Extech Gas Leak Detector Gas Meter GD300 à¤Ã×èͧµÃǨ¨Ñºá¡êÊÃÑèÇ à¤Ã×èͧÇÑ´á¡êÊ