The MODEL DSM-Plus Digital Strain Meters has an optional second channel allowing second extensometer to be used simultaneously or load and strain to be measured simultaneously for a low cost solution to obtaining stress-strain plots for older machines. These also Includes power cord, connector for extensometer(s), output cable and calibration with extensometer. In addition, he dual channel version is very useful for tests which require two strain readings, such as measurement of Poissons ratio or r-value tests on sheet metal samples. It is a low cost solution to upgrading older test systems. One channel is used for strain and the other for the force reading from a load cell. The RS232 digital output or the analog outputs make computerized data acquisition simple.