I would get it, the humidity guages we are requirered to use are piece of junk. They are always way off, every time I clean a cage the humidity drops to 40%, in the whole system, so that is normal. all the tanks are connected by a central air pump, so all tanks hold pretty close to the same temps and humidity.
Usually the new hirers don't really know much, ask for the specialist they are the ones that REALLY take care of them, such as meds and all that. They can tell you how the care has been and will be more helpfull.

thanks
JR