
The quality control of this product is not the highest. I bought this SPL meter to manually calibrate my speakers for my home theater. Set my AVR to reference volume and start playing test tones for different ear speakers. At 1 foot the meter showed 35 dB using slow and weighted values. Changed batteries and same thing. Hit it hard on the back of the counter a few times and it started to work.

๐ฅ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review

๐ฌ๏ธ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review

๐ก๏ธ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review

Portable Handheld Manometer ๐ for Accurate Pressure Differential Measurement
5 Review