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

This item got half good, and half bad reviews. I decided to go with my gut, and trust the brand ( VIVOSUN has never let me down before ).This Ph Meter feels sturdy, has an easy to read screen, easy to understand and calibrate. Functions as it should, does not reach its reading quite as fast as the $100+ competitors, but it still reaches its reading within a reasonable fashion. I have been using it everyday, sometimes a few days go by where I don't have to, and it holds a solid calibration for 30+ days if used correctly and stored properly. There were times I thought maybe it needed a calibration and when I dipped it in the solution, it read exactly what that solution was, so no need for a calibration. 👍. If I need another one for something else, be sure I will get another one of these. Also has a nice plastic storage case and come with an extra set of batteries.

I purchased the Accuracy Water Quality Tester for monitoring the pH levels in my aquarium and hot tub, and it has exceeded my expectations.Pros:Wide pH Range: The 0-14 pH measurement range makes it versatile for various applications.Accurate Readings: The results are precise, and the built-in ATC (Automatic Temperature Compensation) ensures accuracy regardless of water temperature.User-Friendly: It's lightweight, easy to use, and the display is clear and easy to read.Durable Design: The army green casing is sturdy and has a rugged look that feels reliable.Cons:Calibration instructions could be a bit more detailed, but once you get the hang of it, it’s straightforward.This tester is perfect for household use, whether you’re checking drinking water, hot tub levels, or aquariums. It’s a great value for the price!Rating: ★★★★★

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.

I don’t have anything to compare this product to other than pH testing strips. 😅 Functionality is great. It was super simple to calibrate with the included packets. you can buy additional calibration packets for cheap. This pen reads pH values super quick. It was a great value to have these quick readings for all my Fermentation products. Amazon keeps asking me about the temperature control for this device, but it does not have any.