VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Hydroponics, Household Drinking, Pool and Aquarium, with ATC, Orange

Cannot calibrate after 5 months despite taking care of it. Very disappointed. Will never buy another Vivosun product again.

In the states. I received this item very quickly and it was Calibrated as soon as I took it out of the box. I use it very often. Daily for my hydroponics. It comes with everything you need to calibrate it for later down the line. It lights up it’s digital it’s amazing exactly what I needed thank you so much

I have not encountered the need for a battery replacement, indicating the product's high quality. Its construction imparts a premium feel, reminiscent of the top-tier calculators used in school algebra classes. Despite experiencing a few accidental drops, the device has proven durable with no discernible damage. Surprisingly, even the glass bulb has remained intact after these incidents. Additionally, the calibration process was relatively straightforward. The inclusion of three different calibration powders, to be mixed with distilled water for creating the calibration solution, enhances its user-friendly nature. However, a suggestion for improvement would be to include extra sets of calibration packs, as the current provision leaves little room for error, potentially rendering the product unusable in the event of a miscalibration without a backup option.

I’ve only had this for 2 weeks and I’ve had to recalibrate 3-4 times. It won’t hold calibration. I was excited to get this bc the one I had before was the older blue model (can’t remember the brand). Anyways, after fighting w this thing since I received it 2 weeks ago, today it started being so weird. Numbers were flying all over the place. I thought I’d calibrate and see if that would line it out AGAIN... the pictures show the meter in the 6.86 solution. It threw decimals out the window and started just going crazy. It wouldn’t turn off. I finally! Got it to turn off. Turned it back on and it wouldn’t ready anything except 16.00. It would not change. And it’s sitting in 6.86 in that pic also. If you buy this, I hope you have better luck. Or patience. Or maybe you don’t really need to know the ph after all lol now I have to wait another week for a new one bc I just started my refund on this one. If it was me, I wouldn’t do it. Try your luck with a different one. The blue one lasted longer than this. It was crap too but it lasted 6 months. Ughhhh...Edit: instead of just returning the other one, I had them send a replacement. This one is trash too. I just calibrated it yesterday and it’s reading my tap (which is usually around 7.3-7.5) at 8.8. That’s how I can always tell when a pen is way off. I also have a backup pen I’ve been using just to make sure. If it was close, I’d still try to use it. But floating 1.5 in ONE day is ludicrous. I’m sending it back for good this time. Guess I’ll try a different one. I do not recommend this one.

It works great for our purposes

First you have to calibrate it, but it doesn.t hold it long also digital numbers going out already.

Great accurate cheap pH meter

Super simple to use (as are all of these), but the accuracy is questionable at best. Using a 4.0 and 7.0 Standard at the lab at work, this read 4.0 and 7.6, respectively. The calibration is crude and requires out of normal standards for (hydroponics or aquariums) and needs de-ionized water that most home users will not have access to. The standards needed are 4.01, 6.86, and 9.18 which are more expensive to attain. Even after calibration, the accuracy wanders quickly. Unfortunately, that didn't matter too much as the bulb shattered after about 2 months of use. The battery included did last longer than the meter, though...

I recently purchased this pH Tester Pen and I am extremely impressed with its performance. This pen has quickly become an essential tool for me in maintaining the pH levels of my water-based solutions.The accuracy of this pH tester is good. It provides adequate readings within seconds, allowing me to make adjustments to ensure optimal pH levels for my various applications. I have compared its readings with other pH meters, and this pen consistently delivers accurate results.The simplicity of use is another standout feature. The design is intuitive, and the buttons are easy to navigate. The large digital display provides clear and easy-to-read pH readings, even in low light conditions. The auto-calibration feature ensures that the pen is always calibrated correctly, saving me time and effort.The build quality of the pen is also ok. It feels sturdy and durable, and the waterproof design adds an extra layer of reliability. Additionally, the compact size makes it convenient to carry around, whether I'm working in the lab or in the field.One aspect that I particularly appreciate is the long battery life. I have been using this pen for several weeks now, and I haven't needed to replace the batteries yet. This is a great advantage, as it saves me from constantly worrying about running out of power during important measurements.Overall, I highly recommend this pH Pen. It is a good-quality and reliable tool that delivers accurate pH readings quickly and effortlessly. Whether you're a professional or a hobbyist, this pen is a fantastic investment for maintaining optimal pH levels in various liquids.

Es fácil de usar si lo calibras bien. Muy buen producto.

Not a bad product,have to calibrate often and seems kind of like a disposable unit, not bad for the price

Ordered this as i had a grow tent emergency, Worked once and now it doesn't work at all, it turns on and reads PH16, unable to calibrate. Spoke with customer service they said they'd look into to a warranty, we shall see, however had I had known it was problematic I would have spent a bit more and got a more reliable product. and with the delays for warranty etc, my PH problems will likely get worse as i can't measure.

This is a second metre and I like it. Different brand than the first that live on our boat for checking water quality. This is mostly for checking Ph of ferments so accuracy is not critical however I didn't check calibration and it is spot on. Also use it for checking our water supply and it matches the lab tests we run. Heavier than our first unit also seems sturdier although that's only an impression and not a teardown evaluation! Would buy again or for a friend.