
This is my second meter from 7Pros. The first was a few years ago and I still use it today. I find manual calibration much easier and more reliable. It comes with 4 bags of calibration powder, which is very easy to calibrate and accurate. The reading tends to stabilize after about 4 seconds. I use it to adjust the pH of the water for my plants. Everything you need is in the box including batteries and a great water test kit.

π― Honey Refractometer with Automatic Temperature Compensation (ATC) - Tiaoyeer Moisture, Brix, and Baume Refractometer for Honey, 58-90% Brix Scale Range - Honey Moisture Tester
31 Review

Digital PH Meter Tester - Tiaoyeer Water Quality Tester With ATC, 0.01PH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution For Drinking Water, Aquarium, Swimming Pools, Hydroponic
8 Review

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

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

Digital multimeter RGK DM-12
6 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 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