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4.75 out of 5
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  • 14/10/2020

    Its a good way to compare multi meters. Sadly I have no certified nor perfectly calibrated device to check the precision of this reference. I just wanted to check the deviation of my meters and it looks good for me by using this reference. First of all, I soldered a spare LiPo I had laying around that fits into the case. I never would use an unstable USB input to measure my meters. USB charging works perfectly, but the battery looses energy over time. Possible that this device eats some micro ampere, even if its off. But it charges fully in a short time. I tested it with a Vichy VC99 (about 10yrs old), ANENG AN8002 (about 4 yrs old) and UNI-T UT204+ (5 months old). Results were: Vichy VC99: 2.498V | 5.000V | 7.49V | 9.99V UNI-T UT204+: 2.501V | 5.006V | 7.49V |9.99V ANENG AN8002: 2.494V | 4.991V | 7.48V | 9.97V Closest one was my bulky Vichy VC99 and the worst result has my ANENG AN8002. But in the end I'm ok with the result and I will still use all of these 3 meters as the worst measured value was just 0.3% off.

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  • 20/02/2020

    It's a good device, the rations are weirdly good on the board. The only thing that's upsetting is that there's no check mark sheet included, so I'm going to look for a reference device to make these measurements. The packaging is good, the goods arrived without damage. I bought the battery separately, everything works and the battery is charged. I haven't tested for sure yet, but from the first tests, my readings don't depend on the supply voltage, for example, on the discharged ACB and the fully charged readings are the same, which is pleasing. I wanted to put the socket on the ACB board, there's even room for it, but because of the nests, it doesn't. I haven't removed the protective film from the plexiglas yet. I'm satisfied with the purchase, everything's fine. Bangood, as always, pleased! I recommend!

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  • 03/01/2021

    great product. tested on my Fluke meter I borrowed from mu lab and its pretty spot on.

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  • 03/03/2020

    Is operating point

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    OK, countertop tool...

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  • 10/07/2019

    Отличный приборчик. Проверил точность своих тестеров ну и самого прибора тоже. Все точно показывает.

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  • 13/01/2020

    The product wire came off. When I asked where to solder your black wire, they didn't help at all.

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  • 18/11/2019

    Всё хорошо. Ещё не проверил

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  • 04/11/2020

    An indispensable tool for multimeter calibration.

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  • 15/07/2020

    Great little tool. Seems accurate enough down to the millivolt.

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