Japanese Technology at Work | House dust Sensor - Panasonic

A high-speed infrared sensor mounted on the hose detects even non-visible house dust of about 20 μm, such as mite faeces/carcasses, and notifies you via a lamp.
Japanese Technology at Work Website :
Find out about the unique technologies supporting our appliances and deriving the reliability of Japan Quality, which is Panasonic's identity.
https://www.panasonic.com/global/consumer/jq/tech.html
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