 | Metrological standard-prove glass plane-parallel plates The glass plane-parallel plates are intended for checking by the interference method the planarity and mutual parallelism of the surfaces of micrometers and brackets. more detailed ... |
 | Metrological standard-prove glass flat plates The flat glass plates are intended for checking by interference methods the lap-ability and planarity of the measuring planes of plane-parallel end standards of the metre, gauges, measuring instruments and tools. more detailed ... |