
This is a ppm reading on the 500 scale. I've compared it to other meters that measure the same numbers and also used a 1000ppm calibration solution to confirm. If you are trying to save money this is not for you.

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

Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review

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

π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 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