
Good design for a $60 instrument. The instructions are severely lacking in clarity. Turn it on by quickly pressing the top button. Quickly. I also have the pH version and it's designed just as well.

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review

Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
7 Review

80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
10 Review

TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review

π§ UEi Test Instruments DAFM3B Digital Multimeter
6 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 Dioxide Controller for Digital Gas Monitoring
5 Review

π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review