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I’ve used a bunch of different meters over the years and have come to one conclusion. Trash. When a bunch of replacement Bluelab Guardian probes were bad brand new, I threw it all away. They’ll lie (even after calibration) after about 6 months to a year. Test drops have never failed me. Thankfully I’ve always had them to test against digital meters.
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Those vivo sun ph meters are junk. They calibrate to 6.83 and not 7. Where do you even get 6.83 calibration solution? The battery doesn’t stay in place and turn on and off in the middle of readings. Calibrate you pen monthly. I had a blue lab that costs over 100 and are very good but it went up after a long time and got a $40 one that is working just fine.
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5 years? I don’t believe that at all. They don’t last more than a year even if maintained properly. It’s lying to you at this point.
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NEVER buy a digital pH meter. NEVER. Throw that shit in the trash and use test drops.
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