Testo 815 and 816 sound level measuring apparatus testo 0563 8155 this sound level meter from testo can be used for control measurements in air conditioning and heating on combustion systems or in the workplace it can also enable quick and precise assessment of machinery and disco noiseapplications include industry for measurement of machinery noise and construction site noise levels and by public authorities to monitor noise levels at eventswhats in the boxtesto 815 sound level meterca