Neptune Systems A3 Apex Jr Controller SystemNeptune Systems A3 Apex Jr System Get the essential monitoring you need now, expand into control later A3 Apex Jr base unit 2 FMM Ports 2 Aquabus Ports 1 pH probe port 1 Temperature probe port WiFi compatible only (no Ethernet port) New built in audible alarm Expandable Track temperature and pH with included lab grade, double junction probes Monitor water level with new MOS Magnetic Optical Sensor Stay on top of leaks with LD 2 Leak Detection Floor