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The Bard 8301-020 is an OEM room humidity sensor used with Bard control systems to monitor indoor relative humidity and provide a stable control signal for dehumidification and ventilation strategies in Bard wall mount and related packaged equipment applications. Rated for 1 to 4 VDC operation with 5 percent accuracy, this sensor helps the controller make consistent humidity based decisions to reduce comfort complaints and prevent over drying or excessive moisture in the conditioned space. If you are troubleshooting erratic humidity readings or humidity control that will not hold setpoint, replacing the sensor with the correct Bard 8301-020 is a dependable way to restore proper feedback to the system, and as an OEM part it is built to match the original wiring and control expectations for fit and function.