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Proven Heated Diode Technology in an Affordable Package TEK-Mate is the ideal refrigerant leak detector for the light-to-medium duty user who demands reliable leak detection at a budget-friendly price. Features such as the patented INFICON heated diode sensor, variable intensity audible and visual alarms and automatic compensation for changing background refrigerant concentrations make TEK-Mate the best bargain in refrigerant leak detectors. See for yourself why TEK-Mate is the #1 selling refrigerant leak detector in the HVAC/R market.