📏 Calibration Powder Included: Replacement pH Electrode, 0-14 pH Accurate Probe with BNC Connector & 200cm Cable for Continuous Liquid Measurement Review

Used item not working Box sealed with tape Dead batteries Unit will not turn on with included power adapter. The photos speak for themselves. There is also an RMA form in the box.

This is the result after 8 months. These still work fine. I have another double counter that has already failed. The salinity went first. I recommend them and understand that PH changes throughout the day so don't overreact to any particular reading.

This is the result after 8 months. These still work fine. I have another double counter that has already failed. The salinity went first. I recommend them and understand that PH changes throughout the day so don't overreact to any particular level.

Tried to calibrate this thing and it was always off. I followed the instructions and it was just everywhere. Luckily I bought a Hanna Ph tester. I tested Hanner Checker 3xs and the readings were the same. At the same time, he never stopped at a number, not even for a split second. It jumps and wobbles far from the correct display. How much time and money I have in my reef tank, I wouldn't trust this thing AT ALL!

What a disappointment! I just wanted to control the pH. Received product with pH sensor floating in the box, no cap or cap on the sensor. . . THAT DOES NOT WORK ! . . . I can measure the same water 5 times and get 5 different readings + or - 3. Not 3 points but a full 3 ph deviation. SAVE YOUR MONEY! ! ! Why is there so much JUNK on Revain? LoL, the temperature sensor works great, but that makes it expensive.