These little things are balls. The magnet on it is held snugly and firmly by a plastic coating that easily removes metal shavings and dust. I love it and it's really perfect when you work alone and you attach the blunt end of a tape measure to a pipe and I smile all day.
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review