Adopting a medical grade 3.5-inch TFT true color screen design, 6-bit numerical display is more accurate, and intelligent drift adjustment dynamic algorithm is used. The entire drift adjustment process does not require manual intervention. The "zero first and then test method" is used to eliminate the magnetic flux zero point, which is easy to operate and directly displays the magnetic flux value. It has a standard USB interface and can be equipped with software to form an automatic measurement