pH Meter, Digital pH Tester for Hydroponics, pH Temp Meter with Horizontal Display for Pool, Spa, Hot Tub, Indoor Plants, Koi Ponds, Drinking Water, Wine Beer Making, Aquarium, Aquaculture

Great ! Even brought a spare as they work so well. Very accurate and easy to use. No need to spend a fortune, perfect at this price.

7 months it lasted, I needed to change my batteries-no biggy. Apart from it won't display any digits except 0.0000 and the temperature.It won't let me calibrate. I know it's only £20, but how many do you need to go through before you find something that's decent?

Went faulty after two months use requires a new probe

Edit: Great for the price! Despite what i originally thought, it does a great job at staying calibrated (holding strong for 1-3 months now). It contains everything you need to use it *except* the storage solution that protects the bulb - I think they should be more clear about that so you can purchase that too when you're ordering (but it looks like most brands don't include it when you purchase a meter). I'm also going to try one of their other meters in the near future.

I found this PH Tester to be very easy to use, and I have good confidence that it is spot on. A really good product at a really good price. Thanks YINMIKNorm in Texas

I’ve not been this frustrated for a hot minute. I just spent the better part of two hours going back and forth calibrating and re calibrating this stupid pen trying to stabilize the readout and it just won’t work. It reads properly for the test liquids at first and then when I go to actually use it for something I NEED it for and what prompted the purchase to begin with- it DOES NOT WORK. The readouts are off by over 2 whole points nearly every time. Even just testing it to see if it was a fluke, I tried reading my distilled water and it’s telling me it’s at 4.9-5.8 when I know dang well it sits at a perfect 7.1 every time. This pen is utter garbage - unless I got a bad one? I dunno. This has been SO frustrating!

Easy to calibrate and easy to use. From what I can tell it is accurate but I have no way of measuring for certain.

Update: This has never been extremely accurate. However, I was able to use it to get an idea if one acid solution made with vinegar and citric acid is more acidic than vinegar or lemon juice alone for example when canning. I can also use it to determine if TDS filtered water is generally more acidic or alkaline after filtering.There is a pad inside the lid that according to the instructions should stay moist at all times. This pad quickly became moldy and I removed it. The lid was washed and sanitized in a bleach solution. The lid and probe areas still smells strongly of dusty mold so I would never stick it into ready to eat food but rather pour off a sample to test. I have never kept the probe moist as recommended. The probe has never cracked or dried out. I also have never calibrated it since the first time I used it. Surprisingly, It has not needed it and gives same range of readings it always has with the same solutions. Like I said, while not completely accurate it is close enough for home use but is not quick to adjust or respond when being moved from different solutions.Calibrated correctly, so I know that it can determine PH correctly. When testing white vinegar, (5%) it read correctly. However there are sometimes when testing liquids like coffee or water that the readings don't stabilize. For example, when testing a cup of alkaline water, the reading measured 8.6. It gradually over the next 2-3 minutes dropped incrementally until the water had a PH of 6.2. I stopped watching it at that point. I repeated this test multiple times. So either the water is alkaline (over 7) or acidic (under 7) or neutral (7.0) or none of the above. It was hard to know for sure. If you are using this to measure PH of drinking water or filtered water, or using this for critical applications that require accuracy, I would recommend a PH testing alternative that is more reliable and accurate, even if it costs more.Note that the instructions say to shake the instrument side to side to release any bubbles that might be trapped underneath where glass probe is to get accurate readings. I can assure that this was done with vigor and is not a factor in the erratic behavior of the device I describe above.