? The power of the adjustable resistance can withstand the ambient temperature of 70?, when the use temperature is higher than 70? may lose its function. ? The surface of the adjustable resistance should avoid condensation or the existence of water droplets, avoid the use in wet places. ? The rotary operating force of the adjustable resistance will become lighter with the increase of temperature, and become tighter with the decrease of temperature. If the potentiometer is used in low temperature environment, it needs to be explained in order to use special low temperature resistant grease.