YINMIK Food pH Meter with Extra Replaceable Probe for Sourdough and Bread, pH Tester for Fermented Sausages and Salami, Easy pH Measurement of Cosmetics, Cheese, Semi-Solid Samples

Easy calibration buy the £20ph solution box then just poke holes in seal, made job super easy, calibrated both and both read good results, five stars so far ,, time will tell

It was good and works perfect

Works great but need to calibrate before use.

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Works great for my Kefir

Unfortunately, I had to return this one. Once I used it, no matter how much I cleaned it and dried it off, it would not return to 0000, and it would chaotically read different pH levels when not inserted into anything. This one also came with powdered solutions you must mix into distilled water to calibrate. However, it did not come with any storage solution, which you need to maintain the electrode spear. Inside the protective cap, there is a sponge that needs to be slightly moist. If that sponge dries out, it will damage the electrode spear (and the sponge was dry on the protective cap on the one I received — the replacement one was moist, though). It does come with an extra electrode spear replacement; however, both the one it came with and the replacement would never return to 0000 after being used and cleaned, no matter what. I bought a different spear pH tester and have had no problems with it after cleaning it, unlike this one. So I'm not sure if the seal around the electrode on this brand isn't good or if I just got one with both electrodes being faulty.

So far, I think its great. You can put it deeply into your ferments to be sure it is is the safezone where bad bacteria can't grow. I just made some sauerkraut and its perfect. The PH meter helps give me assurance that its safe to eat. The tester is easy to calibrate and easy to use.