Bonneville88, good call! I have the same instrument (Abbeon HTAB-169) in my shop, and have come to rely on it to accurately report my interior climate. I have several inexpensive digital hygrometers, all of which read much "drier" by 8 to 10%. But Abbeon stands by the accuracy of their indicator.
I hear you regarding the undesirable "sauna" effect. This time of year, my shop's dehumidifier runs nearly 24/7 to maintain 52 to 54% RH, and that's with the Trane 18 SEER AC keeping the place at 72° (To get it to down to 50% I have to move in the "big boss", a portable whole house dehumidifier. I have done that once or twice, just 'cause it's fun to watch the indicator plummet and to hear the dehumidifier turn off. ;~}). What would we do without electricity, right?