... measure the thickness of non-magnetic materials (e.g. paint,plastic, porcelain enamel, copper, zinc,aluminum , chrome etc ... n - m a g n e t i c c o a t i n g s o n ... o n -m a g n e t i c m e t a l s . I t ... s u s e d o n anodizing, varnish, paint, enamel,plastic coatings, powder, etc. applied to aluminum, ... .5 AAA(UM-4) batteryOperating condition: Temp. 0~50°C . Humidity <95% .Size: 126x65x35 mm; 5.0x2.6x1 ...