Fieldpiece ATC1R Pipe-Clamp Thermocouple 1/8" x 3/4" for Refrigeration The sensor is virtually isolated from ambient conditions, allowing the thermocouple to read the true pipe temperature for as long as it is attached The sensor's large surface area and increased clamping force help the sensor reach the correct temperature within 30 seconds Because the jaw is designed for HVAC/R, its clamping ability lets you measure temperatures of pipes that are fixed at any angle, to walls or other surfaces ATC1R jaw range: 1/8 to 3/4 pipe diameter (outside diameter) Accuracy: +/- 4-Degree F (2-Degree C) ; 1-Degree F (05-Degree C) after field calibration, 32 to 176-Degree F (0 to 80-Degree C)