This tool is like a super-flexible cross between a palette knife and a spoon - brilliant for scooping gunk out of pots, and for spreading adhesive or grout, but also excellent for moving tesserae, dislodging bits of grout, cleaning up etc.  It is light and strong and has a distinctive olive-wood handle.  The tool measures 20cm long, and the spoony end is 5cm long.   It weighs 26g.