refrigerant leak detector testo model 316-3Delivering sensitivity to all refrigerants, Testo Model 316-3 refrigerant leak detector is resistant to contaminants such as dust, dirt and oil. The hand-held detector features a heated diode sensor, 1-button operation, LEDs that illuminate progressively to show leak size and an audible alarm. The high/low sensitivity adjustment feature allows operators to decrease sensitivity to pinpoint leak sources. An automatic background adjustment, or zeroing, compensates for refrigerant buildup.  
Testo, Inc.;