Portrait ISO 9001 certified manufacturer and service provider of high-quality and innovative measuring instruments. A. Krüss Optronic has been awarded the TOP 100 seal of approval for its outstanding innovative achievements. Automatic refractometers and polarimeters ranging from professional bench-top models to hand-held instruments, with analysis software and 21 CFR Part 11 compliance as well as specialist technical support for various industries. Specialist for microscopes and customized products.