Black holes, quasars and active galaxies. Black holes are objects so dense, and with so much mass, that even light cannot escape their gravity. The existence of black holes has been theorised for more than 200 years. It is impossible to observe them directly, and astronomers had no way to test their theories until Hubble arrived.
Sequence IIIG Test Method. Sequence IIIG testing for automotive engine oils. The Sequence IIIG Test is a fired-engine, dynamometer lubricant test for evaluating automotive engine oils for certain high-temperature performance characteristics, including oil thickening, varnish deposition, oil consumption, and engine wear.
SCS Ionograph Series (SMD II & SMD IV) Ionic Contamination Test Systems. The Ionograph is the industry standard for ionic contamination testing, specified in all commonly used cleaning standards. Each test module is designed to deliver precision accuracy at an affordable price. The series consists of five different test modules, including the new SMD IV, SMD II, small parts, standard and large parts.