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For sale is a RKC REX-C4 Digital Process/Temperature Controller Panel Mount. Item: RKC REX-C4 digital process/temperature controller. Panel-mount unit with dual PV/SV LED displays, front keys (arrows, AT/PARA), and status indicators (OUT, ALM). Rear has screw terminal connections and a wiring diagram label. Retaining clips/housing tabs visible. Condition: Used. Cosmetic wear with scuffs, dust, and white paint specks on the face. Terminals show previous use with short labeled wire stubs. No major cracks seen. Included: controller only; no sensor, manual, or other accessories. Typical uses: temperature/process control for heaters, ovens, kilns, or machinery. Assumption: standard PID type; likely 1/4 DIN size.