If the thermostat in the bator is round with a knob on the side to adjust the temp, it's a wafer type. Feed stores usually carry extras if you ask. I don't really watch humidity that much, but if you're just starting, a hydrometer would be a good thing to get. Add water pans or cups to up the...
https://www.backyardchickens.com/forum/viewtopic.php?id=93158
Linked now.
No reason you won't be able to use it. If you can get it to keep a stable temp and humidity, start hatching away! I assume it has a wafer thermostat so might be a good idea to have one on hand just incase the current one...