Yieryi 7-in-1 Digital PH Salinity Temp ORP TDS EC Water Quality Tester 0.01 Resolution for Aquarium Saltwater Pool Hydroponics

Yieryi 7-in-1 Digital PH Salinity Temp ORP TDS EC Water Quality Tester 0.01 Resolution for Aquarium Saltwater Pool Hydroponics

Aliexpress UK