by Kevan » Fri Apr 19, 2019 5:58 am
I don't mind the readings wandering, I know what the motors should be so a 40k reading on a 19k motor is obviously wrong. Sometimes it needs time to settle, it always seems more accurate out of the car. If you use it in the car you'll get gearmesh sound interfering and the reading will be a few 100rpm lower as a result of the loading.
There is a useful extra, if you look top left there is a pie shaped circle, if you click it you can focus the rpm you think the motor actually is to a 5k rpm range by rotating the open disc, this tends to mask unwanted sounds being picked up.