I checked out the fridge temp at the lowest setting and it cools to ~ 60F - which is what I want for drying fermented sausages , cured meats and ham...
(just in case it did not allow me to go to 55-60F I was going to install a line voltage switching thermostat with the proper range inside the fridge and hook up the input power to the fridge to the switched side of the thermostat..
guess that's similar to the setup you use..
the humidity I do not control... just measure it with a hygrometer... (since I got smart and gave up cigar smoking years ago - ripped it out of my cigar humidor box..)
where I live I do not worry about RH being too low.. Houston is pretty sticky... but since I have been doing this stuff for years here now I do not have any problems ( seeing the RH in my unit between 65 and 70...)
Guess if it would have been too low - add a bowl with water - if too high scrounge around for a small dehumidifier unit..