There is problem in software module located on back side of instrument.remove two screws of software module,pull it upward and remove it.there may me missing some part or loose contact or malfunctionig of it.
i could tell you how to fix it and re-calibrate it.... but i'd have to charge you
i could tell you how to fix it and re-calibrate it.... but i'd have to charge you
i could tell you but id have to charge
although id buy it from you
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