I use these strips for testing in the 3.5-5 range. We can tell if something is much higher or much lower, but it's really difficult for us (us, 3 pairs of eyes, 21-63 years old) to differentiate between stick to chart matches in this area. But at least we know we're in the ballpark, and at least testing the bars below 5 (theoretically). Very easy to use.
Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review
TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review
80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
10 Review
Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
7 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Dioxide Controller for Digital Gas Monitoring
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