JENCO EC 330 Lab Quality Pocket Size Digital TDS EC & Temperature Meter Tester for Hydroponics | Drinking Water | Fresh Water Pools & Spas | Freshwater Aquariums | Up to +/- 1% Readout Accuracy

Jenco pH 630F Lab Quality Pocket Size Digital pH Temperature Meter Tester for Drinking Water, Pool, Aquarium, and Hydroponic Use | .01pH Resolution

Jenco pH610B Bluetooth Wireless Lab Quality Pocket Size Digital pH & Temperature Meter Tester | Perfect For Pools & Spas | Aquariums | Hydroponics | 0.01 pH Resolution