Neptune Systems designed the MPR - Magnetic Probe Rack specifically for the Apex. It will hold the larger diameter temperature probe, pH probe, ORP probe, and salinity probe. Made from acrylic and with strong neodymium magnets, it works securely on sumps and aquariums up to 1/2" thick. The MPR can hold up to 4 probes with one hole being slightly over-sized for larger probes like the Neptune temp probe, ensuring safety and reliability by keeping probes secure and reducing false readings.
