Gain Express 6-in-1 Waterproof pH/ORP/TDS/EC (Conductivity)/Salinity/Temp Meter Pocket Size Multi-Parameter Water Quality Tester Kit Replaceable ORP Probe

Gain Express 6-in-1 Waterproof pH/ORP/TDS/EC (Conductivity)/Salinity/Temp Meter Pocket Size Multi-Parameter Water Quality Tester Kit Replaceable ORP Probe

YINMIK pH Meter Calibration Solution Kit(4.00,7.00&10.01) with pH Electrode Storage Solution Kit,3 Bottles pH Calibration Buffer Solution and 2 bottels KCL pH Probe Solution for pH Meters

General Hydroponics CALiMAGic 1-0-0, Concentrated Blend of Calcium & Magnesium, Prevents Secondary Nutrient Deficiencies, Helps Prevent Blossom End Rot & Tip Burn, Clean, Soluble, & Will Not Clog, 6-Gallon