1. There is no standard for the measured material; <br><br>2. There is no standard for the measured position of the leather material (head or abdomen, front or back); <br><br>3. Whether the detection frequency setting is reasonable;
1. There is no standard standard for the material measured;<br><br>2. There is no standard position measured by the skin (head or abdomen, front or reverse);<br><br>3. Whether the frequency setting of the test is reasonable;
1. There is no standard for the measured materials;<br>2. There is no standard position (head or abdomen, front or back) measured by leather material;<br>3. Whether the frequency setting is reasonable;<br>