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These galvanometers all are that the end checkout finds that , the galvanometer outside works a telephone switchboard and imports without exception correctly. After discovering the bad galvanometer, we have changed a new galvanometer , the malfunction has just eliminated. We think that these galvanometers are not self mass problem being a product for person damaging.

Ammeter these are found in the final test, the ammeter external wiring and input are correct. Ammeter found in poor, we have to replace a new ammeter, the fault would be eliminated. We believe that these are not man-made damage to the ammeter, but the quality of the product itself.