Optical inspection apparatus; Refractometers; Photometers; Optical inspection apparatus for industrial use; Water testing instrumentation for monitoring and detecting contamination; Graphite electrodes; Electronic sensors for detecting microbes; Optical sensors; Sensors for measuring chemical levels in aqueous solutions, not for medical use; Pollutant sensors; Surveying apparatus and instruments; Food texture analyzers; Food moisture analyzers; Scientific instrumentation for measuring chlorin...