When sourcing a dry cabinet, the most critical factor is the humidity control range. For electronics and SMT components, you need a Ultra-Low Humidity cabinet capable of reaching <5% RH. For photographic equipment, a range of 35%-55% RH is standard. Ensure the unit utilizes TE Cooling (Thermoelectric) technology or Dry Unit (Desiccant) technology for stable performance. Additionally, verify the ESD-safe (Electrostatic Discharge) coating, especially if storing sensitive semiconductors, and check for digital high-precision sensors with an accuracy of ±3% RH.