This is a four spot magnetic probe holder. The holes are big enough to fit regular pH, ORP or other probes along with the thick Neptune Apex temperature probes. The magnets used are pre-coated with a resin making them reef safe as long as the resin is not compromised.

Holds up to four probes.
Printed out of reef safe PLA.
Can fit the thick Neptune Apex temperature probe.

Regular price is $15 with the "MARSH15" discount code is $12.75!