Collocations for thermometer - noun

accurate
clinical
digital, mercury
ear, oral, rectal
candy (AmE), sugar (BrE)
meat
Check that the roast is cooked right through, using a meat thermometer.

oven

insert, place in, stick in (informal)
He stuck a thermometer in her mouth.

read

measure sth, read sth
If the thermometer reads 98.6°F, then you don't have a fever.

reading

on a/the thermometer
the reading on the thermometer