GAIN EXPRESS
Digital Combo pH & Temperature Meter, Aquarium Thermometer pH Monitor with Automatic Calibration Function for Fish Tank Hydroponics Aquaculture Laboratory
VACSAX
Water Quality Tester, Rechargeable Digital pH Meter, 5-in-1 pH TDS EC Salinity Temp, with Simultaneous Data Display, for Hydroponics, Drinking Water, Aquarium, Spas, Lab
Bluelab
Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow
Mbnvtxh
5 in 1 Water Tester Water Quality Tester Digital pH Meter PH EC TDS Salinity Temp Pen Meter Precise LCD Digital Multifunctional Water Quality Monitor Test for Aquarium Hydroponics