On many of our Sperry meters there is a hold button that will freeze the screen, holding the information of the last reading you took. When this option is in use, there is a small letter “H” displayed on the screen. This allows you to write down the reading without having to hold the test leads in place.
If you’re having trouble taking readings and the readings on the screen do not change, look for the H. This may be your problem. In other cases it’s due to a low battery, which causes the meter to give faulty readings.