VIVOSUN Digital pH Meter, 0.01pH High Accuracy Pen Type pH Tester for Hydroponics, Household Drinking, Pool and Aquarium, UL Certified

most cheap PH testers are complete BS but this is the real deal. vivosun is a legit company

good for the money

Great tools for my classroom. Thanks!

If you buy this, you're gambling with garbage. Maybe you'll get one that works. Or, maybe like me, you'll get one that won't even calibrate, gives an error, and then just jumps all over. The instructions were pretty easy and the process of calibrating is simple. The product itself is garbage though. I should have just gotten strips but I wanted to test some Alkaline water too which can't be done accurately with strips. Just filtering the reviews to show most recent first, and verified purchases only, revealed significant other complaints. I wouldn't recommend anyone bother with this. Even if I was offered a second one for free, I would decline. It's not worth the effort.

Better

Freshly calibrated, this meter works fairly accurately (within .2-.4 of other sources I trust. I mean, really, for well under $10, it’s bargain! HOWEVER…There is a reason the instructions say to calibrate daily, before each use. After using it about 3 times, in various solutions I found it to be 1.5 units off! But once recalibrated, the circus was back in town and it once again gave accurate readings. But I’m just not willing to go through the calibration hassle before using each time. I even tried a trick a buddy should me where you stuff a tiny bit of cotton, torn off of a ball, way in the back of the lid and very slightly moisten it (6-8 drops?) with distilled water; this is suppose to keep the glass reading probe very slightly moist and therefore help keep it better calibrated.If you’re after accurate readings, and are on a budget, and are willing to pay for extra calibration powder packets, and do the calibrating before every use, this meter might work for you.I returned it and went back to my Biopharm droplet test kit—pretty accurate and reliable (General Hydroponics also makes a good droplet test kit, but not with the .5 increments that the Biopharm reads at).

This Device worked way better than the junk PH testers I had bought before. The light-up display feature made it incredibly easy to read the display in any lighting situation. So far, it has exceeded my expectations.

Comes with three different pH buffer powders. Batteries inside the tester. As well as extra batteries. A guide on how to use the pH tester. Turned on perfectly and turns off easily as well. I’d recommend this pH tester kit for first timers.