9 SENSORS AND REACTORS, ALL FOR MEASURING, TESTING AND MONITORING IN LABORATORY RESEARCH APPLICATIONS; PIEZOELECTRIC CRYSTALS; STRAIN GAUGES; PIEZOELECTRIC AND ELECTROACOUSTIC COMPONENTS; NAMELY, PIEZOELECTRIC RESONATORS, PRESSURE SENSORS, HIGH-PRESSURE SENSORS, STATIC AND DYNAMIC CALIBRATORS FOR HIGH-PRESSURE SENSORS, ACCELERATION SENSORS, METERS FOR DETERMINATION OF THE RESONANCE BEHAVIOR OF PIEZOELECTRIC PRESSURE SENSORS, FORCE SENSORS, DISTANCE SENSORS, OPTICAL SENSORS, CAPACITIVE AND INDUCTIVE TRANSDUCERS, MICROWAVE SENSORS; PROBES AND INSTRUMENTS FOR APPLICATIONS IN BIOTECHNOLOGY AND ENVIRONMENTAL PROTECTION; ANALYZERS OF ENVIRONMENTAL SAMPLES, AND MICROCOMPUTERS AND MICROPROCESSORS FOR SUCH; ION-SELECTIVE SENSORS BASED ON FLUORESCENCE-OPTICAL PRINCIPLES OF MEASUREMENT; FLUORESCENCE PHOTOMETERS FOR SPECTROSCOPIC ANALYSES; MEASURING PROBES FOR MONITORING SEWAGE OR WASTE WATER PLANTS AND FOR PROTECTION OF WATER BODIES; LUMINESCENT INDICATORS; ELECTRO-OPTICAL METERS; ELECTRO-CHEMICAL ELECTRODES; MICROELECTRODES; MICRO-OPTICAL AND MICRO-ELECTROCHEMICAL SENSORS WITH EVALUATION ELECTRONICS; METERS FOR MEASURING THE INTERIOR DIAMETERS OF PIPES; SCALES; SIGNALLERS AND MONITORS; NAMELY, FLOWMETERS, THERMOMETERS, METERS FOR STRUCTURE-BORNE SOUND AND AIR-BORNE SOUND, FLOW REGULATORS, PRESSURE REGULATORS, SPEED REGULATORS; ELECTRONIC LIQUID LEVEL METERS, METERS FOR MEASURING PRESSURE VIBRATIONS IN LIQUIDS, METERS FOR MEASURING TORSIONAL VIBRATIONS, CAPACITIVE DISTANCE METERS FOR UPPER DEAD CENTER OF RECIPROCATING ENGINES, METERS FOR THE COMPOSITION OF EXHAUST GASES, DENSITOMETERS, ANGLE [ MAKER ] * MARKER * GENERATORS, PHOTOELECTRIC BARRIERS, MICROWAVE INTERFEROMETERS, SPEEDOMETERS, CADENCE CALCULATORS, CALIBRATORS FOR SENSORS AND MEASURING EQUIPMENT, ELECTRIC CHARGE AMPLIFIERS; LASER-OPTICAL INSTRUMENTS FOR INVESTIGATION OF FLOW PHENOMENA IN LIQUIDS AND GASES; DIAGNOSTIC APPARATUS FOR INTERNAL COMBUSTION ENGINES BOTH SELF-DRIVEN AND EXTERNALLY DRIVEN, MONITORS FOR INTERNAL COMBUSTION ENGINES IN OPERATION; METERS FOR THERMODYNAMIC EVALUATION OF INTERNAL COMBUSTION ENGINES; BALLISTIC MEASURING APPARATUS , TARGET DETECTORS, GUNPOWDER ANALYZERS, AMMUNITION TESTERS FOR INTERIOR BALLISTICS; DYNAMOMETRIC BRAKES FOR TEST STANDS; CONTROLLERS FOR INTERNAL COMBUSTION ENGINES; AUTOMATED ENGINE TEST STANDS FOR SUBASSEMBLIES AND THEIR COMPONENTS, TEST STANDS FOR TESTING OF AIRCRAFT COMPONENTS