Monitor humidity to ensure that moisture levels remain safe for all critical equipment. Save your property and equipment from costly damage by being warned in time. The sensor activates an alarm when the humidity exceeds or falls below the set limit. The Sensaphone Humidistat Sensor can be used with all Sensaphone models to detect too high or too low a humidity level. The range of the humidistat is 10% to 60% RH. The sensor causes an alarm when the humidity exceeds or falls below the set limit. Multiple sensors may be wired to a single input. Use the following products with the Remote Temperature Sensor: Sensaphone 400 and Sensaphone 800.FGD-0027 Humidistat Sensor for Sensaphone