... ideal instrument for testing purity of precious NAP-7800 Precision Metal Tester Size and Weight: 500*500*400mm/MAX ... ,pt ,Pd,Rh ,Ru ,Cu,Zn ,Ni,Cd,In(Gold,Silver,Platinum,Palladium,Rhodium,Ruthenium,Zinc,Nickel,Cadmium,Copper ... 1~2mmSample Chamber Size: 0~90 mmTest Precision: +/-0.1% The Precision could keep 0.1% after several ... control system can protect themselves NAP-7800 Precision Metal Tester