
I always keep one of these in my bag and they usually last a year or so before the measuring tape snaps or the tape snaps. I can't go without it, so I buy half a dozen of these!

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review

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

Digital multimeter RGK DM-12
6 Review