Mounted on a carriage that slides up and down a vertical pillar. Vertical scale on pillar is graduated 0-15cm x 0.5mm, with a vernier scale on carriage of LC .01mm. The vertical pillar is mounted on a horizontal carriage, which can slide in V-grooves between two parallel, brass guides. Horizontal scale is graduated 0-16cm x 0.5mm with a vernier scale of carriage of LC .01mm. Magnifier can be mounted along either horizontal of vertical vernier scales for ease in reading. The complete assembly is mounted on a strudy, cast-metal base, with leveling screws and a plastic stage in white for good background contrast. Telescope tube can be set vertically or horizontally and has a Ramsden eyepiece with a cross line graticule and rack and pinion arrangement for focusing of image. Both carriages have slow motion lead screws for fine adjustment and lock screws to secure the carriage at the desired position.