This product is mainly used to measure the thickness of non-conductive coating on metal surface, as well as the thickness of non-ferromagnetic coating on ferromagnetic metal (such as iron, nickel, cobalt, etc.), such as paint thickness on automobile surface, coating thickness of metal parts and so on. This product also has built-in magnetic induction and vortex double principle probe, can    automatically identify the measured metal substrate, only need to be placed on the measured surface, can automatically calculate the thickness of the coating.            Specifications:   Probe: F probe, N probe   Magnetic induction: Measuring principle(F), Eddy current effect(N)   Measuring range: 0-2000um   Precision: ±(3%+1um)   Resolution: 0um-99.9um(0.1um) 100um-999um(1um) >1000um(0.01mm)   Zero calibration: Support   Statistics: Average, minimum, maximum, number   Unit: um,mm,mils   Minimum convex Radian: 5mm   Minimum concave Radian: 25mm   Minimum measured area: Diameter 20mm   Minimum substrate thickness: 0.2mm 0.05mm   Maximum measuring speed: 2 readings per second   Power supply: 2*1.5V AAA battery(not included)   Operating environment: Temperature 0-50°C, 20-90% rh (non-condensed)   Preservation environment: Temperature:-10-60°C, 20-90% rh (non-condensation)   Size /weight/material: 113mmX53mmX24mm/80g/ABS            Measurement step:   Step 1. Prepare the parts to be tested.    Step 2. Stay away from the metal object at least 2 cm, press the switch key to turn on.    Note: it is suggested that the instrument should be zeroed with reference to "zero calibration" before    testing.    Step 3. The probe is placed vertically and quickly on the surface to be measured until the drop is heard,    and the measured value is displayed on the screen, and then the probe is lifted at least 2 cm away from    the part to be measured, and the next measurement can be carried out.    Note: if the automatic shutdown function is turned on and there is no operation within 3 minutes, the    instrument will automatically shut down            This machine has two calibration methods:   1. Basic calibration: the base calibration should be carried out when it is used for the first time, or has    not been used for a long time, or when replacing the tested substrate material. There are 7 calibration    points in the basic calibration, and the calibration unit is mm..    a. Prepare 6 pieces of standard film, the thickness of which is in0. 04 ~ 0.06,0.09 ~ 0. 11, 0.22 ~ 0.28,    0. 45 ~ 0.55,1. 90 ~ 1.05,1.90 ~ 2.00.    b. First hold down the up key to hold, then press the on key, LCD full screen kettle display, and then    hear a BI, LCD display Display 00mm, the lower right corner of the LCD displays the CAL character,ʺRelease    the up buttonʺ indicating that the calibration screen is entered.    c. Press the probe lightly on the uncoated aluminum base, at which point the LCD displays 0.00, and    then BI-BI calibrates twice.    d. Get rid of the probe and show the number of 0.05mm on the LCD.