The Myron L DS Conductivity Meter model 512M10 is a portable, hand-held single-range instrument with a scale of 0-10000 micromhos (µMhos) or 0-10000 microsiemens (µS). Field-tested design has evolved over 40 years, making this the most popular and reliable hand-held conductivity meter style in the world. Fast, accurate, on-the-spot measurement with built-in electrodes for maximum protection.