An oven thermometer in the oven which position?

When using an oven thermometer with a few key points: 1. Put the position in general we will be placed in the middle of the oven thermometer on the inside of the position, the distance from issued on the heat pipe is moderate, conditions allow it can be put on the lower level is a, so that more accurate measured temperature. 2. Placed in advance we usually use are mechanical oven thermometer, it can be high temperature resistant, but this kind of thermometer temperature measurement process is long, generally takes 15 minutes to be measured actual temperature stability. So we have to put it in when I was in the preheat the oven to preheat the oven is good, so our thermometer is similar to adapt to the new environment, can show more accurate readings. 3. Can't mechanical water thermometer, generally can be resistant to the high temperature of 300 degrees, but not waterproof, so can't fill in order to avoid damage.