Extech instruments tm55 pocket fold up penetration thermometer extech tm55 p the extech instruments tm55 is a pocket fold up food thermometer that is nfs certified it is used for measuring the temperature of liquids pastes and semi solids for all purpose food checks the tm55 was designed for use in the food industry in homes businesses laboratories agricultural applications for soil and educational facilities p p the tm55 has a ip65 splash proof rating and features a convenien