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Was running some cable at work when I found this hidden in the roof. Anyone know what this is? : r/electricians
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RINGDER RC-326M Refrigeration Temperature Controller Regulator Thermostat Two Sensors Compressor Defrost Fan Function STC-9200 - AliExpress
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Room Temperature Calibration Adjustment Controller Thermostat - China Temperature Controller, Low Voltage Electric Thermostat | Made-in-China.com
![Was running some cable at work when I found this hidden in the roof. Anyone know what this is? : r/electricians Was running some cable at work when I found this hidden in the roof. Anyone know what this is? : r/electricians](https://i.redd.it/8j9q87esxvn81.jpg)