Apera PR60F Dual-Channel pH/ORP/Temp Tester Kit | Flat Sensor, IP67 810666009596 digital readout is fast and hydroponics pH calibration The Black Berkey Primer ZAP-PRO
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Apera PR60F Dual Channel pH ORP Temp Tester Kit Flat Sensor, IP67 810666009596 digital readout is fast and hydroponics pH calibration The Black Berkey Primer ZAP PRO digital readout is fast and accurate and best of all is environmentally friendly with NO mercury 3 cm) and weighing only 7