This instrument is a one-meter base, stereoscopic, horizontal base range finder. Ranges are read directly from the reticles.
The outer tube is made of cast aluminum. The inner tube, made of seamless steel tubing, is supported in the outer tube by means of a gimbal joint. The height of image knob is located on the right end of the instrument; the range correction knob is on the left side. The lighting window of the reticle is above the eyepiece plate. An auxiliary open sight is located above the right eyepiece.
Uniform adjustment of interpupillary distance is obtained by connecting the two eyepieces with steel tape forming a figure 8. Rhomboid prisms keep the optical axes of the eyepieces in alignment with the reticles. The penta prism assemblies are held to circular plates which may be rotated to eliminate tilt of image and place both images at the same height in the field of view.
SPECIFICATIONS
| Power | 8 diameters | |
| Field of view | 5° | |
| Base length | 1 meter | |
| Diopter movement | + and – 4 diopters | |
| Interpupillary setting | 55 to 75 mm | |
| Overall length | 43 3/4 ins. | |
| Weight | 6 lbs., 13 ozs. | |
| Serial number | 1218 | |
| Measuring limits | 250 to 8,000 yds. |
Japanese: p. 181 (March 1, 1945)