Neptune MPR Magnetic Probe Rack
(1000 items available)
The MPR has four locations for either pH, ORP, salinity and temperature probes. And, it is the only probe holder on the market that has a hole large enough to accept the Apex temperature probe from the top. The magnets are incredibly strong and will easily hold the MPR to the side of thickest of sumps (up to at least 1/2").