
Works, stable readings compared to RPM readings from my lathe. I haven't checked if it draws power when it's off (how much cheap electronics just eats up batteries even when it's off). Edit: still using the first battery, in a few years I think? It doesn't consume much juice when it's off.

Handheld Digital Laser Tachometer Non-Contact RPM Meter Motor Speed Gauge Gun Measuring Range: 2
3 Review

π Neiko 20713A Contact Digital Tachometer
3 Review

π Enhanced Precision and Functionality: Protmex Reflective Tachometer
3 Review

π§ Streamline Your Work with Loos Co PT 1 Professional Hands-Free Device
3 Review

π Dioxide Controller for Digital Gas Monitoring
5 Review

Digital multimeter RGK DM-12
6 Review

π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review

π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review