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Johnson Controls A419 temperature controller - $45 (Sun Prairie)
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The Johnson Controls A419 is a single-stage, electronic temperature controller with a digital display, designed for heating or cooling applications (-30 to 212∘𝐹). Widely used for HVAC, refrigeration, and specialized applications like homebrewing, it features a lockable touchpad, adjustable differential, anti-short cycle delay, and NEMA 1 or 4X enclosures.