Optical tube binocular(20? inclined)
Eyepiece(wide field) 10X (view field .87″ DIA)
Objective 0.8X~8X (zoom)
Zoom ratio 1:10
Infinity parallel optical system and 20? inclined optical tube reduce fatigue.
Coaxial illumination is optical for deep holes that cannot be observed by ring light.
Aperture diaphragm is optional for large depth for dield and high quality image.

3M 27714, Cubitron II Roloc Durable Edge Disc 984F, 60+, YF-weight, TSM, Maroon, 3 in, Die RS300VM, 7000045174, 200 per case
3M 87052, Cubitron II Stikit Film Disc 775L, 180+, 6 in x NH, Linered w/Tab, Die 600Z, 7100075206, 250 per case
Insize 2427-10, SPLIT TYPE DIAL BORE GAGE FOR BLIND HOLES, .362-.413", 6928640351358
3M 27705, Cubitron II Roloc Durable Edge Disc 984F, 36+, YF-weight, 6787850, TSM, Maroon, 2 in, Die RS200PM, 7000045169, 200 per case
Dynabrade 95745 1/4" NPT Speed Regulator
3M 60355, Scotch-Brite Roloc Light Grinding and Blending Disc, GB-DR, Super Duty A Coarse, TR, 2 in, 7000046251, 200 per case 