Digital Readout 0-100 (Shore 'A' scale)
For the most consistent results rock the durometer from angled back past straight up to angled forward. The readout will move up to highest (true) reading, then back down. Record the highest reading reached. The durometer must have a straight edge on base to do this properly. If you just push straight down you may get inconsistent and inaccurate results.
Tread Depth Gauge
Super accurate, easy to read, easy to use.