GE Protimeter MMS Plus Moisture Measurement System + Logging Three meters in one The complete meter package! The MMS Plus system combines three different meter functions into one convenient unit, plus it serves as a data logger. It's a revolutionary tool, one that's ideal for the restorer that wants to update to an all-in-one system. Hygrometer Mode Measures the relative humidity, temperature, dewpoint, proximity to dewpoint, and grains per pound (GPP) with the modular, replaceable Protimeter Hygrostick™. Pin Measure Mode Use the penetrating pins to determine the moisture content of wood and the Wood Moisture Equivalent (WME) value of other building materials. Add an optional Hammer Electrode to increase versatility. Pinless Measure Mode Uses non-invasive radio frequencies to detect the presence of moisture without damaging materials. Data Logger Stores up to 1,000 results (with date and time stamp) for downloading to your computer. Allows you to keep clear records of drying conditions that help to safeguard your business and protect your customers.