1.LCD display 2.Easy to carry 3.Automatic shutdown function 4.By using high-speed DSP chip, have fast measurement ability Descriptions:AT-220,AT-230, AT-240 these instruments use magnetic thickness measurement method, can detect the thickness of non-magnetic coating (such as: zinc, aluminum, chromium, copper, rubber, paint etc.) on magnetic metal matrix iron (such as: iron, steel, alloys and hard ...