Mouse Pinkie Or Rat Pinkie? Mouse Pinkie is way to small. Get a scale as said above. Also feed prey items about the same size of the widest part of the snakes body. It might look like there is no way the snake would be able to swallow it but they will. Also try to get him onto Rats if he's not already. Also the Zilla 11939 Temperature Controller is a great thermostat and it's pretty cheap. You can find it on amazon. I got mine for 21$ shipped. Also how are you measuring the temperatures? Wal-Mart carries an AcuRite Indoor / Outdoor Thermometer. It measures 2 temperatures and humidity. Costs about 12$. You place the probe on the hot spot and the actual unit on the opposite side of the tank to get the cold side.