The sextant consists of circular anodized brass plates with a lid that when screwed on the back of the instrument serves as the handle. The lid contains a paper table for natural tangents to the power of 100. The index arm is moved by a milled knob on the upper plate. The sextant has two index shades, in red and green, which are moved by levers. Index-glass adjustment is made by a screw and on the horizon-glass by square headed screws with a key shipped in the upper plate.

Attached to the sextant is a single lens magnifier on a 57mm swivelling arm attached at the pivot. The telescope is 50 mm in length with an erect image, and is fitted in the body of the instrument. It has a red shaded eyepiece and a pinhole sight shutter is fitted for use when the telescope is removed.

The instrument has an inlaid silver scale from -5° to 135° by 30 arcminutes, measuring to 117° (the digits are read from the pivot). The sextant has a silver vernier measuring to 1 arcminute, with zero at the left.

The sextant has no box or case.