Inficon TEK-Mate HVAC Refrigerant Leak Detector is perfect for light-to-medium duty users who seek reliable refrigerant leak detection performance at a fair price. The Inficon TEK-Mate HVAC Refrigerant Leak Detector is designed with the innovative Inficon heated diode sensor, audible and visible alarms, and automatic calibration for background refrigerant concentrations.Made in the USA, 2 year warranty