Do you know if the Sensatronics EM1 will monitor for water on the floor in addition to humidity and temperature?

Yes, with the addition of a Wetness Probe you can detect water on the floor over a wide area. The wetness probe has a long conductive rope capable of detecting water over a wide area. The probe is particularly useful for detecting water in underfloor areas such as a server room or data centre raised floor areas.

The Sensatronics EM1 supports up to 4 wetness probes. Each wetness probe can be expanded to a further 7.5 or 15m with the addition of a Wetness Probe Extension.