General Tools MP905 Deep Wall Moisture Sensor<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The General Tools and Instruments MMD905 Deep Wall Moisture Sensor is an accessory for General's MMD900 and MMD950 Deep Sensing Moisture Meters</li><li>The MP905 extends the measurement depth of the instruments to 5 inches， the length of the MP905's twin probes.</li><li>Like the pins on the MMD900 or any pin type moisture meter， the twin probes sense the resistance between them and convert that resistance to a voltage</li><li>Circuits inside the MMD900 and MMD950 read that voltage as a proxy for the moisture level of the underlying wood or building material</li><li>Utilize this attachment for measuring the moisture in deeper surfaces like walls， thick wood and other industrial tool applications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31gNIhgCYUL.jpg" noproxy>