A survey has been made on the temperature dependent behavior of several new types of carbon resistors and germanium sensors to determine whether any particular type might be suitable as a secondary thermometer in the 0.01–1.0 K temperature interval. Each thermometer was specially constructed to improve the thermal contact to the sensing element. Several commercial germanium and carbon resistance sensors appear promising as thermometers in the very low temperature interval. In addition, it appears feasible to extend the use of 0.02 at.% Au&sngbnd;Fe thermocouples down to 0.05 K.