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Digital Meters

HM Digital COM-80 Pen Style TDS EC & Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Hydroponics & Pools -45% Off
HM Digital COM-80 Pen Style TDS EC & Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Hydroponics & Pools
$27.49 $49.99
HM Digital Hydromaster HM100 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Hydroponics, Aquariums, Pools & Drinking Water Analysis -45% Off
HM Digital Hydromaster HM100 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Hydroponics, Aquariums, Pools & Drinking Water Analysis
$159.49 $289.99
HM Digital Hydromaster HM500 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Aquariums, Hydroponics, Pools & Drinking Water Analysis -45% Off
HM Digital Hydromaster HM500 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Aquariums, Hydroponics, Pools & Drinking Water Analysis
$197.99 $359.99
HM Digital Hydromaster HM100 Professional Water Quality Tester - Continuous Monitoring for pH, TDS, EC & Temperature | Perfect for Hydroponics, Aquariums & Drinking Water Analysis -45% Off
HM Digital Hydromaster HM100 Professional Water Quality Tester - Continuous Monitoring for pH, TDS, EC & Temperature | Perfect for Hydroponics, Aquariums & Drinking Water Analysis
$159.49 $289.99
HM Digital Pro PH 200 pH and Temperature Meter - Professional Water Quality Tester for Pools, Aquariums, Hydroponics & Home Brewing -45% Off
HM Digital Pro PH 200 pH and Temperature Meter - Professional Water Quality Tester for Pools, Aquariums, Hydroponics & Home Brewing
$60.49 $109.99
HM Digital TDS-3 Water Quality Tester with Temperature Measurement - Portable TDS Meter for Drinking Water, Aquariums, Hydroponics & Pool Testing -45% Off
HM Digital TDS-3 Water Quality Tester with Temperature Measurement - Portable TDS Meter for Drinking Water, Aquariums, Hydroponics & Pool Testing
$19.24 $34.99
HM Digital COM-80 Waterproof TDS EC Temperature Meter Pen - Accurate Water Quality Testing for Drinking, Aquariums, Pools & Hydroponics -45% Off
HM Digital COM-80 Waterproof TDS EC Temperature Meter Pen - Accurate Water Quality Testing for Drinking, Aquariums, Pools & Hydroponics
$27.49 $49.99
HM Digital Hydromaster HM200 Portable pH TDS EC Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Pools & Hydroponics -45% Off
HM Digital Hydromaster HM200 Portable pH TDS EC Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Pools & Hydroponics
$164.99 $299.99
HM Digital Pro COM 300 Professional Water Quality Tester - pH, TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pool Maintenance -45% Off
HM Digital Pro COM 300 Professional Water Quality Tester - pH, TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pool Maintenance
$93.49 $169.99
HM Digital AquaPro Water Quality Tester - Accurate TDS & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pool Testing -45% Off
HM Digital AquaPro Water Quality Tester - Accurate TDS & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pool Testing
$21.99 $39.99
HM Digital Pro COM-100 Water Quality Tester - TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pools -45% Off
HM Digital Pro COM-100 Water Quality Tester - TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pools
$49.49 $89.99
HM Digital Pro COM-300 Water Quality Tester - pH, TDS, EC & Temperature Meter for Hydroponics, Aquariums & Drinking Water Testing -45% Off
HM Digital Pro COM-300 Water Quality Tester - pH, TDS, EC & Temperature Meter for Hydroponics, Aquariums & Drinking Water Testing
$93.49 $169.99
HM Digital Waterproof Professional Series TDS Meter Kit - Accurate Water Quality Testing for Drinking Water, Aquariums, Hydroponics & Pools -45% Off
HM Digital Waterproof Professional Series TDS Meter Kit - Accurate Water Quality Testing for Drinking Water, Aquariums, Hydroponics & Pools
$104.49 $189.99
HM Digital Hydromaster HM200 Portable pH TDS EC Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Pools & Hydroponics -45% Off
HM Digital Hydromaster HM200 Portable pH TDS EC Temperature Meter - Water Quality Tester for Drinking Water, Aquariums, Pools & Hydroponics
$164.99 $299.99
HM Digital Hydromaster HM500 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Hydroponics, Aquariums, Pools & Drinking Water Analysis -45% Off
HM Digital Hydromaster HM500 Continuous pH TDS EC Temperature Meter for Water Quality Testing - Perfect for Hydroponics, Aquariums, Pools & Drinking Water Analysis
$197.99 $359.99
HM Digital TDS-3 Water Quality Tester with Temperature Measurement | Portable TDS Meter for Drinking Water, Aquariums & Hydroponics | Includes Protective Case -45% Off
HM Digital TDS-3 Water Quality Tester with Temperature Measurement | Portable TDS Meter for Drinking Water, Aquariums & Hydroponics | Includes Protective Case
$19.24 $34.99
HM Digital Pro PH 200 pH & Temperature Meter - Accurate Water Testing for Pools, Aquariums & Hydroponics -45% Off
HM Digital Pro PH 200 pH & Temperature Meter - Accurate Water Testing for Pools, Aquariums & Hydroponics
$60.49 $109.99
HM Digital Pro COM-100 Water Quality Tester - TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pools -45% Off
HM Digital Pro COM-100 Water Quality Tester - TDS, EC & Temperature Meter for Drinking Water, Aquariums, Hydroponics & Pools
$49.49 $89.99
HM Digital AquaPro TDS Temp Meter - Water Quality Tester for Drinking, Aquariums & Hydroponics | Accurate TDS, Temperature & PPM Measurement | Perfect for Home, Lab & Outdoor Water Testing -45% Off
HM Digital AquaPro TDS Temp Meter - Water Quality Tester for Drinking, Aquariums & Hydroponics | Accurate TDS, Temperature & PPM Measurement | Perfect for Home, Lab & Outdoor Water Testing
$21.99 $39.99
HM Digital Waterproof Professional TDS Meter Kit - Accurate Water Quality Testing for Drinking, Aquariums, Hydroponics & Pools -45% Off
HM Digital Waterproof Professional TDS Meter Kit - Accurate Water Quality Testing for Drinking, Aquariums, Hydroponics & Pools
$104.49 $189.99