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Different kinds of metal detector Inspection:

Metal detector
Security detectors
Fold walk through metal detector
Hand-held metal detector
Underground metal detectors.
Metal detector door
Transport metal detector

metal detector inspection-security detector quality control
Some 
common factors for metal detector quality control:

Appearance check
Quantity check
Measurement of product
Packing check
Function test
sensitivity level check
Battery voltage check
Internal check
Product endurance test
Pull test for cord
Charging test 
Hi-Pot Test



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