9 MEASURING INSTRUMENTS FOR SCIENTIFIC PURPOSES, NAMELY, SCALES OR METERS FOR MEASURING WEIGHT, ELECTRIC CURRENT, ELECTRICAL VOLTAGE, VOLUME, TEMPERATURE, HUMIDITY, PRESSURE, CYCLE, RADIOACTIVITY, POWER, LIGHT INTENSITY, SPEED, DENSITY AND CONCENTRATION; TESTING APPARATUS USED FOR TESTING MOTOR VEHICLES, BRAKE UNITS, BRAKE LININGS AND MACHINE TOOLS