12mL Syringe
These 12mL oral syringes have clear markings, a very handy built-in tip and include a plug/cap that looks like a pumpkin. The tip size and width is roughly the same as those commonly found on 10mL bottles- so maybe not the best thing for filling a bottom-port tank like the Kayfun, but very, very handy for DIY applications, top-fill tanks, and similar.
They ship clean, but not in sterilized packaging, so you may want to give a brief wash before using just as a precaution.