I have my pm2 module, salinity probe amd orp probe off of my apex gold that I only used for a year. Orp has been submerged and capped off while out of the tank.
$150 shipped for EVERYTHING
$115 shipped for pm2 and salinity
$45 shipped for orp only
$150 shipped for EVERYTHING
$115 shipped for pm2 and salinity
$45 shipped for orp only