American Marine PINPOINT pH Probe

PINPOINT. This is my go to replacement brand sensor for my reef tank monitoring system. Have used many over the years. Very reliable, high value.

My 2nd one. First one cracked after a short period of time. I was disappointed as I dont recall doing anything that may have caused it but it was just in the bottom of the sump. I now have a probe holder holding the second one and no issues to date. It did need to be calibrated out of the box when used with my Apex aquarium controller.

Compaired to hanna and milwaukee probes and or checkers this ones seems a little off not by much but still off..

I wont really know until I know how long it lasts. The orginal one did not last long at all.

Excellent accurate device!

I have used Pinpoint PH monitor for 15 years from saltwater aquarium to freshwater aquariums. The probes have always been easy to calibrate and last. However the probes from this company are temperamental and the bulb on the end always seem to break. After owning 2 of these now in ~18 months my opinion is they are of poor quality. And the package is poor, makes me think they are used. I would rather spend the extra money and get my probes direct from American Marine

These work until they don’t. They need to be calibrated every 3 months or so and replaced every year. I recommend if you have the space in your tank or sump running 2 (the Neptune Apex has 2 Ph ports). Why not? Nothing worse than seeing parameters drift with no explanation. You’ll know when they stop working because suddenly your PH will become erratic or drift. They’re no better or worse than the Neptune “brand” version. I recommend getting some Ph solution to make sure they arrive calibrated correctly. I have ordered 2 and both have been good out of the box but you never know.

I have the monitor and the guardian monitor, both needed new probes, these were super cost effective, came packaged safely, plug n play, calibrated in a snap, and has held calibration as well as the OEM part did. (maybe better, as it was replaced, am i right?)

Has anyone noticed these are slightly smaller diameter than normal and require extra tightening of the ph port gland in your calcium reactor?

good