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Connect an external lockout sensor (eg float switch)
Bluelab Power Relay R4 available separately for electronic mains switching
Single unit contains rollers and internal tubing
Get everything you need to keep your Bluelab OnePen accurate
Auto-resume dosing after power loss
Bluelab ORP Meter halloween25 Connect an external lockout sensorMonitor Oxidation Reduction Potential (ORP) to track solution quality, disinfecting power, and sanitation throughout the growing cycle. Compact, handheld design for convenient use Bright, easy to read backlit display Replaceable Bluelab ORP Probe (with BNC connection) No ORP probe calibration required KCl filled probe cap to keep the probe hydrated 2 metre 6. 6ft cable for measuring in hard to reach locations Dual compatibility allows optional use of