Very high quality and made in Japan these are one of those things you wish you'd had years ago. Its a vernier scale on a ruler with a T head! Very handy for workshop measuring and marking in both woodworking and metal workshops.
2 sizes available:
One can use these Scale Calipers like a vernier caliper for measuring lengths and widths of timber boards or even sheetmetal work. As per the photo above you can also pull the Scale Stopper vernier head out of the way and use the tool as a T square to mark off a square line and mark off lengths from an edge.
The T Scale rulers must be purchased as they are, ie: you cannot buy the ruler with scale stopper and add the T head at a later date. They come complete and precision assembled from the factory as you see them in the photos.
Easily read a measurement down to 0.1mm with the vernier scale stopper.
There is an excellent metric/inch conversion chart on the back of these rulers.
For information on how to read a vernier scale we suggest checking wikipedia or similar, there are many excellent explanations out there.