Digital display instrument is a kind of high - intelligence - Online portable aluminum melt rapid measuring instrument which is designed by the principle of Telegas. Measurement range can be achieved 0.001-0.999ml no / 100g Al, the error can be accurate to plus or minus 0.001 ml no / 100g Al, effective to the aluminum melt, in addition to the role of hydrogen monitoring during the entire process, the quality of ingot has been better protected.