TEKCOPLUS 0.00~14.00PH Probe Electrode with BNC Cable for Water,Pool,Hydroponics,Calibration Powder,Aquarium (300 cm Electrode)

I am currently using these for my Neptune Apex unit for a reef tank. They both were accurately calibrated out of the box when they arrived. As a precaution, I decided to do a 2 point calibration anyway. I have been using them for the past 6 weeks to give an honest review. I have purposely not done another calibration so I can document when they start to drift. I normally would want to calibrate every 2-3 weeks as a precaution. I am very pleased with how they have been performing. I would order with confidence again. In the screenshot I shared you can see the variance in the two probes. 0.05 is about the threshold I would say is time to do a calibration. They are starting to drift in my opinion. But they are still very accurate. Just not as precise. They are quick to respond to dosage chemicals which is important if you are controlling chemical pumps based on pH.

Ottimo, fa il suo lavoro

Parfait, vaut bien les sondes qui coûtent 2 fois plus chères ;)

Muy por debajo del precio de otras con la misma función pero de marcas conocidas. Sin dudarlo volveré a comprarla cuando la necesite

Sehr schönes Produkt funktioniert gut und ist nicht so teuer wie die originale