Máquina Probadora de Pureza de Oro para Joyería Industria Banco Peón Industria Rango 300g
(1 Set of MDJ-300K Gold Purity Tester Machine. The K value and purity of gold, silver, copper, gold and silver can be switched circularly. copper), gold purity%(including gold-copper-silver, gold-silver, gold-copper).