material measure with star-shape grooves, type ASG material measure, star-shape grooves measurement standard
material measure/measurement standard that of a number of grooves with triangular cross-section in the X-Y plane with respect to the azimuthal orientation, pinnamõõt/pinnaetalon, mis hõlmab mitmeid kolmnurkse ristlõikega sooni X-Y tasapinnas asimuudi orientatsiooni suhtes