octagonal pie gauge mpi calibration

{"cid":"91150510","title":"Octagonal Pie Gauge Magnetic Field Indicator Standard Octagonal Pattern MPI Magnetic Particle Inspection Field Test Piece","imgUrl":"https:\/\/img.chinax.com\/nimg\/d2\/1d\/275073ebd16df84bf6f1f5338abc-200x200-1.jpg","attrs":{"Brand Name":"HUATEC","Minimum Order Quantity":"1 pc","Delivery Time":"7-10 working days after receipt of your payment","Certification":"CE","Payment Terms":"T\/T,Paypal","Diameter":"Approximately 20\u201330 mm","Place of Origin":"China","Supply Ability":"10sets\/Month","Packaging Details":"Carton packing box","standards":"ASTM E709, MIL-STD-271, ASME, etc.","Thickness":"Approximately 3 mm"}}

{"cid":"91225121","title":"Pie Gauge Octagonal Magnetic Field Indicator","imgUrl":"https:\/\/img.chinax.com\/nimg\/43\/54\/1be37e3626a7e5c15b4cc07b03d6-200x200-1.jpg","attrs":{"Brand Name":"TESTECH","Model Number":"Pie Gauge","Minimum Order Quantity":"1 pcs","Delivery Time":"within 5 days","Certification":"CE; ISO","Place of Origin":"CHINA","Payment Terms":"T\/T,Western Union,PayPal","Supply Ability":"500 pcs","Packaging Details":"In Carton","Product Type:":"NDT Testing Tool","Application:":"Magnetic Particle Testing (MT)","Shape:":"Octagonal \/ Pie Shape","Standard:":"ASTM E709, ASTM E1444, ASME V","Function:":"Check magnetic field direction & magnetization effect","Usage:":"Industrial non-destructive testing"}}