The Thermal Scanner is one of the gadget that you will use to detect the presence of a ghost in the area. When you use it, you can locate where the ghost is located. You will use it on the vault of the Bank and on the prison.
How to Get the Thermal Scanner
Head out of the house and then run over to Main Street. Go inside the bakery and talk to Jane the baker. Tell her, “Fiona sent me.” She then walks over to the pastry case and it sinks into the ground. A new case rises up to replace it and it contains all kinds of cool ghost hunting gear! One of which is the Thermal Scanner.