The Myron DC4 Digital dissolved solids conductivity meter is a high-quality instrument designed for measuring the conductivity of dissolved solids in water. With a range of 0-20, 200, and 2000 ppm, this meter is perfect for industrial, commercial, and scientific applications. The Myron brand is known for producing reliable and accurate measurement tools, making this conductivity meter a valuable asset for any testing and measurement needs. This meter is new old stock and approximately 25 years old