The initial measurement was relatively good compared to another pH meter in the range of pH 4 - 4.5, but the build quality is terrible. The one and only time we calibrated it to improve its accuracy in alkaline pH, the adjustment screw broke, the pH meter became miscalibrated, and ultimately it was thrown away. It is not worth the money.

Very good for its price. It is a cheap tool that with a little attention and care before and after use, you will get an idea of the pH of the liquid you want to measure. I would say it is not for professional or frequent use.

So far so good. No major complains and looks sturdy.
I tested it without calibration and worked fine.

Based on the use I made, it seems reliable, while it also has good construction. At its price, it definitely worth it for amateur use

Very reliable! I compared it to a laboratory microbiological meter. And definitely ValueForMoney!

I have bought it 2-3 times and it works well for a short period (6 months). Now I will switch to a more expensive one to see the differences. Anyway, for its price, I think it does a good job.