<div style="text-align: justify;">The substage 'ST-13' is purposed for use with simple biological microscopes. It serves to move a specimen along two orthogonal axles.<br /><br />The substage scales allow to determine position with 0.1mm accuracy that makes easy to find marked places again.<br /><br />The substage has a base with alignment pins to mount it onto a microscope stage. There are also mechanisms for a specimen moving.<br /><br />Lengthwise movement is accomplished by means of a screw that moves the specimen holding arms (static one and spring-loaded one).<br /><br />Lateral movement is accomplished by means of a rack-and-pinion mechanism.<br />It is possible to use standard slides (30x75mm).</div> <p>Actually, this is just a version of much more common ST-12 substage, but this is made for left-handed people.</p> <p>The item is usable, but has three issues: missing screw in one of coordinate knobs (easy to repair), bent axis of other coordinate knob (does not affect anything), missing securing screw (can be replaced).</p>