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Grow Lights Grow Systems, Parts & Pumps Plant Food Growing Containers / Media pH/TDS Testing Meters - pH Meters - TDS / PPM Meters - Combo Meters - Meters for Soil - Other Meters/Accessories - Calibration Solutions - pH Test Kits - Thermometers & Hygrometers - Measuring Cups / Devices Climate Control Propagation Supplies Pest & Disease Control Garden Tools Books & Magazines Sprout Seeds & Supplies Clothing Brew Supplies 
 FloraDuo A Gallon $33.95 $30.56 Save: 10% off FloraDuo B Gallon $33.95 $30.56 Save: 10% off FloraGro Quart $11.95 $10.76 Save: 10% off 
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 Calibration Solutions 7.01 pH Calibration Solution 8ozGeneral Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General... $7.50 $6.75 Save: 10% off  7.01 pH Calibration Solution QuartGeneral Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General... $20.95 $18.86 Save: 10% off  4.01 pH Calibration Solution 8ozGeneral Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General... $7.50 $6.75 Save: 10% off  4.01 pH Calibration Solution QuartGeneral Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General... $20.95 $18.86 Save: 10% off  pH Cleaning SolutionUsed to clean meter tip. Works for both pH and conductivity meters. Comes as a two part A and B cleaning solution to remove both organic and... $8.49 $7.64 Save: 10% off  HM Digital 1000 PPM Calibration 3 ozFor optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges. NaCl calibration... $7.95 $7.16 Save: 10% off  Hanna 1500 ppm solution - small 230mlGroCheck conductivity solution made from high quality Potassium Chloride is standardized and calibrated. Conductivity value at 25°C: 1,500 ppm. Comes... $13.95 $12.56 Save: 10% off Hanna 1500 ppm solution - large 500mlGroCheck conductivity solution made from high quality Potassium Chloride is standardized and calibrated. Conductivity value at 25°C: 1,500 ppm. Comes... $20.49 $18.44 Save: 10% off  Hanna 1382ppm Calibration - 230mlreads 1382ppm on the NaCl scale (1934 on the 442 scale) Can be used with most meters with a sliding scale -Online Prices Only- $11.95 $10.76 Save: 10% off |
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