How to make fruit tree wound protector?

The liquid wax is prepared with 6 parts rosin, 2 parts animal oil, 2 parts *** essence, and 1 part turpentine oil. First heat up the rosin and animal oil at the same time, stir well and then remove from the heat to reduce the temperature, then slow

How to use QDF-3 hot ball anemometer

How to use QDF-3 hot ball anemometer :
1. Observe whether the pointer of the meter refers to the zero point before use. If there is a shift, you can gently adjust the mechanical zero adjustment screw on the meter to return the poi