by RodinBangkok » Sat Jan 18, 2014 11:59 pm
Check the humidity tolerance, as a lot equipment for controlling humidity has a quite wide tolerance. The best most accurate systems will do a wet to dry bulb type sensing, which can be very accurate, others use a different sensor technology that is not as accurate as wet/dry bulb measurement. Calculating using wet/dry usually means more cost, as the control systems are more complicated. This is in general, not saying you can't find a cheaper unit that has good control. With all the PID controllers now out there that are so cheap I think with a little digging you can come up with a good wet/dry control system pretty cheap, if they already aren't on the market.
Another option are CVAP type holding units that have good humidity/temp controls. The other factor in buying this equipment is the standards that they may be able to meet. A lot of commercial equipment like this is rated for different industry standards such as NSF which can add costs compared to some that are not agency approved. The difference for the home user is not at all significant, it has mostly to do with Agency Inspection requirements.
I am the master of my fate:
I am the captain of my soul.
_____
Rod