About: http://webisa.webdatacommons.org/372848816

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For such a control, the known apparatus and measuring methods are usable only within limits, and there is a need for a portable device which would make it possible to carry out the necessary measurements at any time and at any place.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com