How to Use UNI-T UT343D Coating Thickness Gauge

Specifications:
Material: plastic
Color: black+red
Iron matrix measurement/Not iron matrix measurement(FE/NFE): 0~1250um/0~49.2mil
Minimum convex radius of curvature: 5mm
Minimum concave radius of curvature: 50mm
Minimum measured area diameter: 20mm
Minimum basic thickness: 0.5mm
Accuracy: ±(3%H+1)uM
Display: 2" 320x240 pixels TFT
Measuring range: 0~12500um or 0~49.2mil
Power supply: 2 x AA batteries
Size(L x W x H):about 23x22x6.5cm
Weight: 133g
Beli UT343D/ Buy This Product:
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[@raheel3203]

I have this one but I don't know how I use

[@raheel3203]

Can you speak English I don't understand your language