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Portable People Meter - Wikipedia
https://en.wikipedia.org/wiki/Portable_People_Meter
The Portable People Meter (PPM), also known as Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are …
PPM - Wikipedia
https://en.wikipedia.org/wiki/PPM
PPM (Pay per 1000 impressions) Other uses in science and technology. Parts per million, ppm Carbon dioxide in Earth's atmosphere, CO2 ppm; Peak programme meter, measuring audio level; PPM Star Catalogue of 378,910 stars; Proton precession magnetometer, measures small magnetic field variations; Pulse-position modulation of a signal. Other uses
百萬分率 - 维基百科，自由的百科全书
https://zh.wikipedia.org/wiki/%E7%99%BE%E8%90%AC%E5%88%86%E7%8E%87
百萬分率（英語： parts per million ，缩写作 ppm ），定義為百萬分之一，1ppm即是一百萬分之一。. 例子: 一公斤（kg）的物質中有一毫克（mg）的某物質，某物質含量即為1ppm；; 一公升（L）的溶液中有一微升（μl）的某物質，某物質含量即為1ppm；; 一公升（L）的溶液中有某物質一毫克，某物質含量即為 ...
Nielsen Audio DA120A PPM 360 Meter User Manual DA120
https://usermanual.wiki/Nielsen-Audio/DA120A/info
When the power supply is connected to the Cradle, the meter is placed into the Cradle in order to recharge the Meter. Meter Accessory item: Adapter Alternate equipment item: Model HP110 Nielsen Audio PPM 360 Collector The Models DA120A PPM 360™ Meter is a device that is worn or carried on a person, usually by means of a belt clip.
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