Review on 🌡️ VIVOSUN PH Meter Digital Tester Pen: Accurate 0.01 Water Quality Measurement Range for Household, Pool, Aquarium & More - ATC, White by Brian Whitmore

I only have 2 weeks and had to recalibrate 3-4 times. The calibration will not survive. I was excited to get this because I had an old blue model (can't remember the brand). Anyway after struggling with this thing since I got it 2 weeks ago it has gotten so weird today. Numbers were flying everywhere. Thought I'd recalibrate and see if it balanced AGAIN. the pictures show the flow meter in solution 6.86. He threw the decimals out the window and started going crazy. He didn't switch off. I finally! Was able to turn it off. Turned it back on and nothing cooked except 4pm. It won't change. And also in this photo 6.86. 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 because I just started getting refunds on this one. If it were me, I wouldn't do it. Try your luck with others. The blue lasted longer. It sucked too, but it took 6 months. Ughhhh.Edit: Instead of just returning another one, I asked them to send a replacement. This one is junk too. I just calibrated it yesterday and it shows my tap (which is usually between 7.3 and 7.5) at 8.8. So I always recognize when the pen is far away. I also have a backup pen which I used to be sure. If it was around I would still try to use it. But swimming 1.5 in ONE day is ridiculous. This time I am definitely sending it back. I think I'll try another one. I don't recommend this one.