The single-output Plug‘n’Grow External Probe Day & Night Relative Humidity Display Controller with adjustable differential precisely monitors and maintains moisture levels in any greenhouse or indoor garden. Unit displays the ambient relative humidity and features adjustable day and night triggers from 5 to 100 percent humidity. When levels surpass or drop below the predetermined points, the controller will activate connected ventilation, humidifying or dehumidifying equipment (not to exceed 120 volts, 15 amps or 1 horsepower). Differential is flexible from ±2.5 to ±12.5 percent and remote probe is on a 10’ cable. Reliable unit includes a one-year manufacturer’s warranty and daily technical support.