Invo 34 Teeth Variable Spline Indicator Ring Gauge with Dial Indicator Federal A1/2Q. 0001 Graduation and Setting Master Plug MG-287-3. Old stock, in good condition, with minor dings, master comes with certificate of calibration expired on 4/88. For measuring component effective tooth thickness. Mfg: Invo Spline Inc. We inspect and test all items that come into our shop. However, we deal with a large variety of items and our knowledge of some items is quite limited. Because of this we offer a 48 hour inspection period on all items that we sell. Good customer service is our only goal. Please let us know immediately if there is a problem with your item. All returning items must include original packaging, please return item in the same condition as received. This item is in the category “Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Inspection & Measurement\Inspection Gages”. The seller is “mycyberoffice” and is located in this country: US. This item can be shipped worldwide.