The small and medium goniometers were accurate. HOWEVER, the largest (the most important) was inaccurate by 1.5-2 degrees. Look at the picture how the 90 degree indicators (on either side) don't line up with each other due to the moving arm.
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 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
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
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Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review