Voltcraft um5 1 5 in 1 multifunction environmental tester voltcraft um5 1 100 p the voltcraft um5 1 is a 5 in 1 multi function environmental tester which combines 5 meters in one anemometer luxmeter sound level meter thermometer and hygrometer p p the sensors for light strength temperature and humidity as well as wind speed are applied with a pluggable connection cable and can be used away from the meter the measuring microphone for sound level measurements is firmly integrated in