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	Replacement Probe for HM Digital Waterproof Combo Meter COM-100 Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature. Three different calibration options (KCl, 442TM, NaCl), each with its own non-linear conversion factor. Automatic Temperature Compensation (ATC) using three temperature... Only $31.94
	Replacement Probe for HM Digital Waterproof pH Meter Model PH-200 Measures pH and Temperature. Auto-ranging three point calibration with digital fine tuning. Includes 4 pH buffer solution in a sponge embedded in a clear cap. Waterproof housing. Simultaneous temperature display. Measurement Range: 0-14 pH. Digital automatic... Only $36.91
	HM Digital In-Line Dual TDS Monitor Model DM-1 Displays TDS levels of the feed water and product water with in & out electrode probes. Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery power. The unit shuts off automatically after... Only $32.31
	HM Digital Handheld TDS Tester Model TDS-3 Ideal for commercial use. Includes a carrying case with belt clip. Highly efficient and accurate due to its advanced microprocessor technology. Hold Function: saves measurements for convenient reading and recording. Auto-off function: the meter shuts... Only $25.91
	HM Digital Aquapro TDS Water Tester Model AP-1 Measures total dissolved solids (TDS) and temperature. Automatic Temperature Compensation (ATC) Water-resistant housing Measurement Range: 0-5000 ppm Digital Calibration (push button) Auto-off function, data-hold function and low-battery indicator. Display:... Only $29.76
	BlueLab Soil pH Meter Replacement Probe BlueLab Soil pH Meter Replacement Probe Only $78.75
	Tri-Meter Replacement pH Probe -- 3' Cable Replacement probe for the Tri-Meters or the pH Meters. 6 month limited warranty. Only $53.93
	Nutradip CMS PPM Meter The Nutradip® CMS (constant monitoring system) Nutrient Meter has automatic temperature compensation and measures the TDS ppm/EC in your water. 2 year limited warranty on meter. 6 month limited warranty on the probe. Instructions Only $77.94
	Bluelab pH Up Solution - 500 ml If your pH isn’t in the right range – and that’s 5.5-6.5 for most plant varieties – your nutrients are likely wasted. Too high or too low, and you’re in trouble. The result is nutrient deficiency or complete nutrient... Only $10.33