Patent ID: 8888971

Claim:
A dynamic precious metal assay device for determining the karat of a precious metal test specimen where said device is combination of a sensor pencil assembly with an insertable disposable cartridge assembly containing electrolyte that may be ejected and on the distal lower end of said pencil assembly is a porous cap assembly holding a reference electrode wherein the said dynamic precious metal assay device comprises: a flexing means on said an insertable disposable cartridge assembly which is capable of expelling said electrolyte by compressing flexing inward in response to an external pressure exercised by a user and self restoring back to its initial volume on relaxation of said pressure; a slit diaphragm located between said insertable disposable cartridge assembly and said porous cap assembly which acts as a two way valve for the efflux of the said electrolyte to said porous cap assembly on compression of said insertable disposable cartridge assembly and reflux of unused electrolyte on removal of compression; whereby the efflux is a precisely measured delivery of electrolyte to said porous cap assembly assuring a uniform wetting of said porous cap assembly so as to form an electrolytic cell with precision contact to said test specimen assuring accurate assay and on reflux of unused electrolyte through said slit diaphragm, a self cleaning of the dynamic precious metal assay device occurs.