Please Note: The new warm temperature exchanger would not have probe mounting hole, should use buckle probe rather than probe resistance fee of 2 types of 10K, 50K, the appearance is the same, with the multienergy meter at 25 levels =10K or 50K, the better the temperature, the smaller the resistance value. Shown within the video are some customers who must punch the built-in temperature sensor, we offer punching service. The inside diameter of the opening is G 1/8"Buyers who don't have solid installation qualifications should not buy it. Please notice that when shipped, the sensor is rarely included.