Calibrated and certified measuring equipment down to one half millionth of an inch.did work for the federal government, NASA ,Tinker Airforce base ,Kelly AFB ,Eggling AFB ,HONEYWELL, GE,SANDIA NATIONAL LABS,And lots of other top 100 companies and military MFG. secret clearance Also Los Alamos labs. I also sold very high precision measuring products sale price into the hundreds of thousands dollars I sold Lasers and many other measuring artifacts .