Checked with a spirit level and found the bubble is not quite centered. So I marked the spot where she was dead using some squares and planes. Once I did this they worked fine.
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
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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
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review