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  2. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    Harbor Freight Tools won a declassification of the class action; that is, the court found that all the individual situations were not similar enough to be judged as a single class, and that their claims would require an individual-by-individual inquiry, so the case could not be handled on a class basis.

  3. Heathkit - Wikipedia

    en.wikipedia.org/wiki/Heathkit

    Oscilloscope OL-1 from 1954, the company's first with a relatively small 3-inch CRT which allowed for a highly competitive price of US$ 29.50 (equivalent to $345 in 2024) for the DIY kit. [ 1 ] Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company .

  4. Nephelometer - Wikipedia

    en.wikipedia.org/wiki/Nephelometer

    A nephelometer [1] or aerosol photometer [2] is an instrument for measuring the concentration of suspended particulates in a liquid or gas colloid. A nephelometer measures suspended particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam.

  5. Aethalometer - Wikipedia

    en.wikipedia.org/wiki/Aethalometer

    The aethalometer has been developed into rack-mounted instruments for use in stationary air quality monitoring installations; transportable instruments which are often used at off-grid locations, operating from batteries or photovoltaic panels in order to make measurements at remote locations; and hand-held portable versions for measurements of ...

  6. Nephelometry (medicine) - Wikipedia

    en.wikipedia.org/wiki/Nephelometry_(medicine)

    Nephelometry is a technique used in immunology to determine the levels of several blood plasma proteins. For example, the total levels of antibodies isotypes or classes: Immunoglobulin M, Immunoglobulin G, and Immunoglobulin A. [1]

  7. Holter monitor - Wikipedia

    en.wikipedia.org/wiki/Holter_monitor

    In medicine, a Holter monitor (often simply Holter) is a type of ambulatory electrocardiography device, a portable device for cardiac monitoring (the monitoring of the electrical activity of the cardiovascular system) for at least 24 hours. The Holter's most common use is for monitoring ECG heart activity (electrocardiography or ECG).

  8. Unipath - Wikipedia

    en.wikipedia.org/wiki/Unipath

    The kit was designed for use in identifying the period of peak fertility in a prospective mother's menstrual cycle so that the optimal time for insemination leading to conception could be determined. In 1996 Unipath released a complementary product, the Persona fertility monitor , designed to identify fertile and infertile periods in the ...

  9. End-of-train device - Wikipedia

    en.wikipedia.org/wiki/End-of-train_device

    A "dumb" ETD can be as simple as a red flag attached to the coupler on the last car of the train, whereas "smart" devices monitor functions such as brake line pressure and accidental separation of the train using a motion sensor, functions that were previously monitored by a crew in the caboose. [1]

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