Two photos: One is a set of breaking fixtures, as I like to call them. I created them for the purpose of strength testing my new glass-based material. The older, smaller breaking fixture is at top, followed by the larger, later fixture. Below that is a bar of my new material. Below that is a mold for casting such bars. I cover the mold with aluminum tape to increase moisture retention. The second photo is the breaking fixture in action. The force sensor is FC2211-0000-0025-L from Mouser.