PH Meter Digital Water Quality Test TDS PH EC Temperature 4 in 1 Set for Indoor, Pool and Aquarium Water

TDS PH meter set is a professional water test meter.
Application: Pure water production and drinking, tap water, well water, seawater
Aquarium water, swimming pool water, amniotic fluid, soil
aquaculture, food processing
Saliva, enzyme, chemical experiment, ionized water, pH of human urine and so on


How do I calibrate the PH meter?
STEP 1: Clean the el...