Endoscopes for industrial use; Endoscopes for technical purposes; Clamp meters; Conductivity meters; Level meters; Light meters; Moisture meters; PH meters; Pressure meters; Radio-frequency power meters; Speed meters; Voltage meters; Water meters; Refractometers; Microscopes; Magnifying glasses (optics); Magnifying instruments; Frequency meters; Apparatus for sound level measurement; Inclinometers; Digital thermometers, other than for medical purposes; Infrared thermometers; Thermometers, not for medical purposes