Pop-Up Disposable Cooking Thermometers for perfect, safe results every time.  Variety Pack -  Sold in packs of 18 pieces, includes six pieces each of (3) variations :

Yellow- Pops at a  medium-rare 138 degrees Fahrenheit - PERFECT for Beef Prime Rib!

Red - Pops at a medium 145 degrees Fahrenheit - perfect medium finish for Beef Round Roast!

Green - Pops at a safe 160 degrees Fahrenheit - perfect for pork roast or ground beef or meat loaf!

In the notes section of your invoice tell me how you want them; All same temp, 1/2 and 1/2, 6 of each,  etc..