American Marine PINPOINT pH Probe

WARNING: Does NOT come with calibration fluid or instructions. It would be nice if they stated this in the description, as the item is useless without calibration fluid. It also does NOT come with instructions.

This replacement probe adds new life to my American Marine PH meter. Calibration with this probe is easy and quick. It is working well for my planted tank.

Works perfectly. I hooked it up to the HCS12 MC9S12C128 microcontroller and it produced proportional voltages correctly. Keep in mind that you need to purchase the calibration solutions (#7 and either/and #10, #4) to make sure your sensor is reading properly. The probe will read properly every time; negative voltages for one side of the pH scale and positive for the other. However, your sensor (be it homemade or bought) may not interpret and display the CORRECT pH value without calibration first.

Works great

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.

Measurements are repeatable. Has been very reliable for months.

Works great with bluelab combo meter for hydroponics. good replacement and a better build quality than the blue lab.

To early to ask if product works as well as others. But so far it works great.

Arrived fast and was as described

Good value. Holds its calibration well and stabilises at a new reading fairly quickly. Its not a high priced unit so I did do a quick check on the accuracy. After calibrating with standard buffers at 7.0 and 10.01 I made up a pH 7.8 potassium phosphate buffer solution and the probe (with American Marine pinpoint pH meter) gave a reading 0f 7.79. Im a home user and only interested in the range from 7.0 to 9.0 so please bear that in mind when reading my review.