120V to 1.5V

Hi, I recently bought a remote thermometer but it all runs off of watch batteries and I don't want to have to keep replacing them whenever it dies. I was wondering if there is anyway I could take the 120V from my house and convert it down to 1.5v then permenently wire the remote temperature sensor to the house power. I am not totaly in the dark, could I use a plug transformer and get it down to 3V and then use a resistor to kill the rest?

Who cares, it would be more stable over time and temp than most other solutions and it would be precise. The OP isn't going to keet a '317 active with such a light load on it anyway.