Special Features:

Used with a light guide cable and light source, purchased separately, to visually inspect the insides of engines and aircraft structures; the light guide cable connection and eyepiece are acmi type; includes padded carrying case and operation manual; 35 degree field of view, with diopter adjustment and eyecup; manufacturers name: 4 mm x 28 cm

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.