That's three stars because it came with no paper certificate, just a sticker on the unit, and the description said "This product includes a calibration certificate traceable to NIST (National Institute of Standards and Technology)" as well as the calibration period from April 19, 2016 to April 19, 2017, so I just lost five months of the certificate without using it.
π BAFX Products Pressure 30 - 130DBA Warranty
9 Review
π Cadrim Digital Sound Level Meter: Accurate Measurement and Noise Control Solution
6 Review
π Enhancing Accuracy on the Go: Introducing Protmex Portable Measurement Accuracy Selection
7 Review
π Digital Sound Level by Parts Express
6 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review