They do the job, but they're not quality Starrett calipers or anything a machinist would want to use. They are good for measuring inside holes +-0.030 where the tape won't reach etc. These are roughly machined, non-locking steel calipers that are inexpensive.
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
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π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review