No but a thermometer will make sure you know right when your meatloaf is perfectly cooked. It should read 160°F. You can test the meatloaf with a metal fork to see if it is cooked. Poke the fork into the center of the loaf and if it is met with little resistance, it is more than likely done. If, however, it is still pink, put it immediately back in the oven and continue cooking.