Profile: Electron-Machine Corp., The manufactures refractometers, x-ray thickness gages and other process analyzers. Our refractometers are used in the pulp and paper, food & chemical processing industries. Our X-ray thickness gage provides continuous accurate and high-speed metal strip measurement. Our DSA E-Scan is an automatic and bench-top critical angle refractometer with a digital readout and temperature-controlled sample chamber. It measures the critical angle of refraction of sample fluids which are directly correlated to various measurements including percent dissolved solids and refractive index.