I bought a tool from Amazon that was supposed to test wetness, pH, and light intensity. The tool is the XIYIXIFI 3 in 1 Soil Test Kit. It failed the wetness test. After watering with water running out the bottom of the pot, I used the tester. Now the meter goes from dry to wet with moist in the middle. One would think the tester would show wet when you test just after watering. I did make sure it was set to the right meter. It tested just barely moist. That was kind of disappointing. Well not to be deterred I tested the moisture many more times over the next couple of weeks with similar results. Boo!
So, what about the light meter? Well setting to measure light intensity I put it in direct sunlight. It measured just a tick above dark. I tested it on the lamps I use for growing seedlings. The result was the same. Double boo!
I did not test the pH meter. I didn't have a "control" to use for that test. But based on the results from the other two tests I would venture the results from the pH test would be a failure as well.
Don't buy this meter. It would be a waste of money. I haven't tested any others yet so can't make a recommendation except not to purchase this one. Hopefully my next tool test will get better results.