My local Radio Shack has a combination thermometer/hygrometer (spelling??) for $19.99. Is that typical for a hydrometer? It's day 20 in the incubator and I'm really curious about the humidity level in there (too much humidity)! Also, anybody else have one from radio shack? The thermometer I'm using in the 'bator is also from radio shack and is still accurate with a degree after four years! What's better, a digital hydrometer or one used reptiles??