Proskit 寶工 MT-2017N 26檔指針型防誤測三用電錶 基礎操作

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Dear proskits, I bought a 2017N on Black Friday Aliexpress last year 2022 at the Max Fiber store, I was very well attended, the multimeter arrived in perfect condition working perfectly, but 3 (three) days later the continuity buzzer stopped beeping, making only a roc, roc sound. I need the multimeter electrical diagram to be able to fix it, I already requested it in every way and I didn't have access, I asked Proskit by email, I asked the store that sold it to me, and so far I haven't been able to get an answer ,please help me