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

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.

Allows me to accurately test my water's pH. Make sure to use the calibration as instructed and it'll treat you right.

Will not calibrate.Buyer should be made aware that this meter needs to be calibrated before they make the purchase.You will need distilled water and measuring graduated cylinder.Calibrating this device is a pain because nothing works as it says it should in the instructions.Further more the calibration instructions are provided twice. The first set of instructions is written only while the second is a diagram. The bad news here is that they contradict each other.So it takes time and effort to find out that this thing DOES NOT WORK.I am a very unhappy customer

This product makes t easy to get a good accurate all important PH reading At the time of this review have used it for several grows and it is still durable , reliable and has been of good service

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 is a good buy and easy to use. Mix the reagent with 1 cup water and calibrate with one button. Read my pool pH with one button. I lost my pH probe exactly like this and replaced it with a new one.

Easy to use nice instruction to guide you through setup and then just hold it in your tank and in no time it gives you your PH reading so your fish will be happy