Check the listing for details. Edge technology Tool Post Indicator. Condition: Used. Listed at 45.00 USD. Purchased with a lot of tools from a prototype shop that was in operation less than three years. I don’t have a lathe, so I never used it. Moves smoothly, no dings or obvious damage. From the manufacturer: Reduce set up time with the Tool Post Indicator by Edge Technology. This unit is much faster to install and more rigid than a mag base indicator holder. It is the best way to align a work piece in a 4 jaw chuck. Model #42-000 has one position and can be used to indicate the OD of the workpiece. High resolution 0.0005" indicator included. Mounts in any tool post tool holder AXA or larger. Body made from high strength aluminum. Durable anodized finish. Includes padded case. Protected by one or more US patents.