So after doing a salt test with my existing hygrometer and the new Radioshack one, the results are:
Radioshack is 5% above RH! My old one is dead nuts on. I'm releaved that my old one is dead on and will go about getting another one for the coolidor. I'm kind of disapointed and will be returning the radioshack one tomorrow. <<insert smilie with tail between its legs and head bowed down>>