
I followed directions step by step and it will not calibrate. Could not even get it past the first solution. Hold for 5 seconds and flashed error every time. Try to return or replace and apparently there is a no return policy.

📊 PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review

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

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

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