How should I assess humidity-control accuracy when buying a commercial proofing cabinet?

When assessing humidity-control accuracy in a commercial proofing cabinet, check sensor range, control deadband, humidification method, exhaust capacity and humidity recovery after the door is opened. Have the supplier run the machine with representative dough and log the process data, capturing both average performance and abnormal samples because a good average can hide unstable operation. Before signing off, insist on a dough-specific trial: weigh loaves before and after proofing to confirm the cabinet holds target humidity without excess condensation or crusting, since only real dough reveals true control accuracy. Where models look similar, compare measured application data, not motor power or nominal speed.