PM1 pH/ORP Probe Module

Neptune Systems PM1 – Expand Your Apex System's Monitoring Reach Add a second pH or ORP measurement point to your Neptune Apex controller with this compact expansion module. The PM1 plugs directly into your existing system via AquaBus, giving you an extra probe port for monitoring a second tank, calcium reactor, or ozone system—plus a dedicated temperature sensor port and I/O connection for external switches like float sensors and push buttons. Perfect for multi-tank setups or advanced automation, it integrates seamlessly with Apex Fusion for unified control. Compatible with A2 and A3 series controllers. Probes and accessories sold separately.