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  2. Hach Company - Wikipedia

    en.wikipedia.org/wiki/Hach_Company

    Hach Company manufactures and distributes analytical instruments and reagents used to test the quality of water and other liquid solutions. Manufactured and distributed worldwide, Hach systems are designed to simplify analysis by offering on-line instrumentation, portable laboratory equipment, prepared reagents , easy-to-follow methods, and ...

  3. Category:Hardness tests - Wikipedia

    en.wikipedia.org/wiki/Category:Hardness_tests

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  4. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    The Knoop hardness test; Other hardness scales. Hardness scales may also refer to: Methods of measuring the deposit formation by hard water. The scale of Pencil hardness

  5. Rockwell scale - Wikipedia

    en.wikipedia.org/wiki/Rockwell_scale

    A Rockwell hardness tester. The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]

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  8. The best laundry detergent sheets of 2025 - AOL

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    Smell test: The literal smell test involves a cotton swatch being dipped in a solution made from a detergent sheet dissolved in four cups of 70-75°F water. After soaking for 30 minutes, the ...

  9. Leeb rebound hardness test - Wikipedia

    en.wikipedia.org/wiki/Leeb_rebound_hardness_test

    The Equotip (later on also called simultaneously as Leeb method) rebound hardness test method was developed in the year 1975 by Leeb and Brandestini at Proceq SA to provide a portable hardness test for metals. It was developed as an alternative to the unwieldy and sometimes intricate traditional hardness measuring equipment.

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