how to use micrometer screw gauge

{"title":"High Precision 75-100mm Outside Micrometer for Outer Diameter Measurement","imgUrl":"https:\/\/img.chinax.com\/nimg\/86\/f9\/f75bb66275bc8e99baf6aa2cfb09-200x200-1.jpg","attrs":{"Brand Name":"KM","Model Number":"KM-2106-100","Delivery Time":"Within 15days","Certification":"ISO DIN GB RoHS","Place of Origin":"Shaanxi, China","Payment Terms":"T\/T, L\/C, D\/P, D\/A, Western Union, PayPal, MoneyGram","Supply Ability":"50000pieces\/Month","Packaging Details":"ABS Box 22*11*3cm\/Piece 0.70kg\/Piece","Warranty":"One Year","Measurement Object":"Outside Diameter","Measurement":"Metric","Range":"75-100mm","Graduation":"0.01mm","Precision":"0.004mm","Feature":"Ratchet Stop","Measuring faces":"Carbide","Processing":"Fine Lapping","Package":"ABS Box"}}

{"title":"LDM-50 Wire Cable Laser Diameter Micrometer \/ Laser Diameter Measurement Gauge","imgUrl":"https:\/\/img.chinax.com\/nimg\/76\/16\/ea754af05f99acfa3827cbb921c4-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"Mercury-tech","Model Number":"LDM-50 LDM-25 LDM-100B LDM-150 LDM-25XY LDM-50XY LDM-60XY","Minimum Order Quantity":"1 PCS","Delivery Time":"In three days after getting your payment","Certification":"CE ISO9001","Place of Origin":"China Zhengzhou","Payment Terms":"T\/T","Supply Ability":"500 Set\/Sets per Month","Packaging Details":"Carton or Wooden Box","Material":"Metal","Type":"Measurement Tool","Measurement Accuracy":"\u00b10.001mm","Lead time":"Within 3 days","Color":"Blue","Operating voltage":"~ 220V plus\/minus 15% 50 - 60Hz or per request"}}