Grindometer No. 51

Path size: 2 x 5 in
Number of trajectories: 1
Scales: 8 - 6 Hegman / 0 - 25 Microns
Dimensions (approx.): 0.75 x 3.5 x 7.5 in
Net weight: 8 lbs (3.6 kg)

Includes:
Metal plate with scale
Scratcher
Case