Manufacturer: Microplan   Model: Black Granite Surface Plates   Black granite surface plates are manufactured to different accuracy grades : 3 , 2 ,1 , 0 , 00 and 000 according to ISO 8512-2. All Microplan surface plates are tested with electronic levels or laser autocollimator in a temperature and humidty controlled environment.   A test report is included with each plate and when requested, Microplan will supply a test report from an authorized organisation.   Microplan surface plates are supplied in "standard" sizes as well as different flat surface tolerances. In addition these surface plates can be supplied to a customer's own specification and drawing (see special working) and with holes, glued threaded inserts and T-slots.   A selection of granite feet, adjustable columns, or steel support are available.   Sizes: 300 x 200 x 50 mm 400 x 250 x 60mm 400 x 400 x 60mm 500 x 315 x 70mm 500 x 500 x 80 mm 630 x 400 x 80 mm 800 x 500 x 100mm 1000 x 630 x 140mm 1000 x 1000 x 160mm 1200 x 800 x 160mm 1600 x 1000 x 180mm 2000 x 1000 x 220mm 2000 x 1500 x 250mm 2500 x 1500 x 300mm