
These pieces of paper do not determine anything, I took the soil on which moss grows (it is sour by definition), the piece of paper did not even stain, it just got wet

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

📊 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

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