I didn't see a machinist forum to ask questions so I decided to post here. If this is bad the administrator can delete or delete this post.<br>I recently inherited these calipers. They are Fowler brand and 12". I am posting pictures in hopes someone can help fill me in on them.<br><br>I have a 9" set made by Mitutoyo. I use them constantly. This set is a little different.<br><br>Questions There two locking screws on top of this one (why). There is a roller underneath that I would think is for fine adjustments, but the only thing it does is if you tighten it, it will lock the calipers. Does anybody know what model number these are? <br>Then what do you think these are worth?<br><br>Thanks,<br>Bruce