Hanna Instruments HI9813-6N Portable pH/EC/TDS/Temperature Meter

Mettler-Toledo SevenEasy pH Balance Meter 8603, Tested

Apera Instruments WS200 Fluoride/pH/Conductivity 7-in-1 Portable Meter Kit

APERA Instruments SX721 pH/ORP/Conductivity/TDS ++ Portable Meter Kit

HI 99161 Hanna Water Proof pH/Temperature Meter with Probe

VWR Scientific Digital Mini pH Meter Model 49 Free Shipping

Thermo Scientific Orion VersaStar Pro Electrochemistry Meter pH Conductivity TDS

Apera PH700 Benchtop Lab pH Meter 0.01 Accuracy with 3-in-1 pH/Temp. Electrode