Patented heated diode sensor provides
High/low sensitivity adjustment and automatic zeroing
Our best refrigerant leak detector
yet to find the most refrigerant leaks
Easy one button operation
The Testo 316-3 is our best refrigerant leak detector yet, that delivers dependable, rugged performance at a great value. The proven heated diode sensor provides great sensitivity down to 0.15 ounces/year including the new refrigerant blends like R-410A, R-407C, and R134-a, allowing you to find the most refrigerant leaks.