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User Guide Moisture Meter Model MO250 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Back to the Extech MO250 Product Page Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com...
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Introduction Congratulations on your purchase of the Extech MO250 Moisture Meter. The MO250 detects moisture in wood and other building materials such as brick, wall board, sheet rock, cardboard, paper, plaster, concrete, and mortar. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
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Operation Electrode Pins CAUTION: The electrode measurement pins are extremely sharp. Use care when handling this instrument. Cover the pins with the protective cap when the instrument is not in use. The electrode pins are replaceable / removeable and must be inserted before the meter can be used.
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Carefully push the electrode pins a minimum of 0.07” (2mm) into the material under test. Note that the pins should be inserted into wood perpendicular to the wood’s fiber structure. For high moisture readings, it may 0.07” (2mm) take several minutes for the meter reading to stabilize.
External Probe (optional) An optional external probe is available (part number MO252) that allows the user to reach into areas that would be difficult to access with the meter’s built-in electrode pins. The input socket for the external probe is located at the top of the meter. The plug and jack are keyed so that the plug can only fit in the jack one way.
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