Special Features:

Hhas a yellow identification band on eye piece; working length is 500mm +/- 25 mm; angle of view is 60 deg; light cable angle is 180 deg; the unit may have some adjustment on focusing; t.O. 33b4-2-20-1

Properties:

A viewing device used to visually inspect items such as cannon bores, internal combustion engine cylinder walls, propellant perforations of rocket motors or similar items, for defects of manufacture, corrosion, scars, erosion, etc., without the necessity of disassembling the item(s). It may or may not have extension tubes to cover the various ranges of inspection. The item is basically a straight-tube telescope using a mirror or prism.