You can get this at Ace in Mid Valley Megamall in KL. It is placed on the shelfs somewhere infront the main entrance. This was some time ago, so they may have shifted them inside.
If not just go to PetSafari in the reptile shop. They will know what you are talking about. I've bought the thermometer and hygrometer in the picture below from PetSafari before:
Hover your computer mouse over this picture of click on it for a larger view.
