Dspeed 500 rpm continuous; 1000 rpm intermittent; 9 chararacters per wheel; 3 wheels; numeral h 0.19 in.; numeral color lusterless white per federal std595; background black per fed-std-595; material, shat, cres steel 303; pinions, partition, and wheels to be delrin; materal life rating 10 million revs of drive shaft at 500 rpm; storage temp -54degs c to +95 degs c; operating temp -55 degs c to +105 degrees c; vibration rating 5-500 hz at max of 20 gs peak input