Measuring apparatus, namely, electronic measuring apparatus and sensors for measuring and monitoring physical and chemical variables, including speed of rotation, air speed, light intensity, noise, pressure, temperature, and gas properties, including moisture, indoor air quality; imaging measuring apparatus and sensors, thermal cameras; electronic measuring apparatus and sensors for recording biological variables, in particular for biotechnological metrology; accessories for electronic measuring apparatus, in particular testing, measuring and monitoring devices for electronic measuring apparatus, electronic instruments for controlling and regulating physical and chemical variables, including speed of ration, air speed, light intensity, noise, pressure, temperature, and gas properties, including moisture indoor air quality; calibration devices for calibrating measuring apparatus and sensors; computer software, in particular for calibration, adjustment, validation and qualification of electronic measuring, controlling and regulating apparatus and sensors