i absolutly don't understand how to use differents items, should i try all levels with each of them in all rooms ?
i don't know if hunting contracts are ramdom but for one of them i found temperature 21 with ectoplasm and the answer was a wraith ...
To activate the tool, the bar below the tool's icon must be fully filled (you need to press it 6 times at the first tool level. The higher the tool level, the fewer presses are required).
It’s best to first find the ghost's favorite room using the thermometer. (There’s a high chance you’ll need to use the thermometer several times). If the temperature in the room is between 19 and 24 degrees, it’s a room where other tools will work.
( Except for the EMF reader and UVL – they will work in any room with a 100% chance of displaying evidence. The Ghost Writing Book, Ectoplasma Glass, and Spirit Box are tools that will only work in the ghost's favorite room and have a small chance of showing evidence (15% at the first level of the tool).
A temperature of 21 degrees doesn’t mean the ghost has the "High Temperature" evidence, so you should use the thermometer again (since the temperature in the ghost’s favorite room can be between 16 and 21 degrees). If the temperature is higher, it means the ghost has the "High Temperature" evidence.
It’s best to buy a level 2 thermometer as soon as you have enough money, as it displays the result in color.
Hope this helps a bit