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.

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.

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.

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!

Хороший прибор, пайка как ни странно на плате качественная. Единственное что огорчило, это то что не идёт в комплекте лист с контрольными измерениями, буду теперь искать эталонный прибор чтоб сделать эти измерения. Упаковка хорошая, товар приехал без повреждений. Батарею покупал отдельно, все работает и батарея заряжается. Точно ещё не тестировал, но с первых тестов моих показания прибора не зависят от напряжения питания, например на разряженной АКБ и полностью заряженной показания одни и те же, это радует. Хотел поставить разъем на плату для подключения АКБ, там даже место под него есть, но из за гнезд он не влазит. Защитную пленку пока не снимал с оргстекла. Покупкой доволен, все хорошо. Бангуд, как всегда, порадовал! Рекомендую!

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!