How do you know the thermometer calibration?

Aquarium thermometer is used to detect the water temperature in the tank, so its accuracy is very important, before put the thermometer in the fish tank we need to do a good job of the calibration of the thermometer. So how do the calibration? Today we talk about how to calibration aquarium thermometer. 1. In general, we can come into contact with more accurate temperature measurement instrument is the thermometer. This belongs to the medical apparatus and instruments, usually more accurate. Traditional mercury thermometer has some own characteristics need to be taken into account: the first is the relatively small measuring range, 35 ~ 42 ℃ ( Actually swing its nadir is around 32 - 33 ℃, but the smallest scale only 35 ℃) Secondly it is only to heat up. The traditional mercury thermometer in vacuole top have a capillary, temperature drops when mercury can disconnect from here, mercury will come down. This is to ensure that the thermometer take out from the body will not change the design of the reading because of the outside temperature is low. So after finished will jilt ah ah. 2. How do the calibration? With a basin of water, it is good to moderate, too little is not appropriate, too much waste of water. Put a heating rods, transferred to the above 35 ℃. Into the aquarium thermometer, temperature stable ( Is the heating rods began to stop heating stage) 。 Then at the time of heating bar lights in the thermometer, 2 ~ 3 minutes later contrast clinical thermometer and aquarium thermometer, difference is the tank the error of the thermometer. If you want to on time again remember to put a little stir stir water pump into the water. This method at room temperature, the higher the better. How's that？ You learned? Note: this method is to measure a presumably, professional calibration or want to professional manufacturers.