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How to calibrate? I bought brand new but always measure higher that the real. Not accurate. I already compare german brand that can measure accurately.
![ปฏิเสธไม่ไหว (Crush on you) - LIPTA feat. No One Else [Official MV]](http://i.ytimg.com/vi/NBw1jF342vw/mqdefault.jpg)
How to calibrate? I bought brand new but always measure higher that the real. Not accurate. I already compare german brand that can measure accurately.