The normal tool we use is Chicago Pneumatic scribe which comes in any number of sizes depending on what you want to use it for. Paleo Tools has a wide selection of the Chicago and also services them. We have a coarse one for removing bulk matrix and a finer tipped one for finer work. Invertebrate paleo has some new tools that they call “German” which are Universal Tool air scribes UT8617. I was told they were around $900 apiece but online I see them listed for around $255. The Chicago runs around the same.
I hope this helps