Used to quickly and accurately isolate leaks in all commercial, industrial and automotive air conditioning and refrigeration systems. It detects all HFC, CFC and HCFC refrigerants including R134A, R12 as well as blends such as R404A, R408A, R409A, R410A, and others. Fully automatic and requires very little power to operate by using state of the art microprocessor controlled technologies. A spare sensor housed in the battery compartment, also insures no down time when sensors are damaged or need replacing. Features: Simple, one button operation. Two sensitivity modes, enabling quick and easy location of large and small leaks. Both visual and audible leak detection signal. Low battery indicator. Automatic power-off to conserve battery life.