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2. Hach Company - Wikipedia

   en.wikipedia.org/wiki/Hach_Company

   Hach was also manufacturing and selling more than 100 different portable water test kits for laboratory and field use. These kits were employed in water and sewage treatment, water conditioning, cooling towers, wildlife conservation, and boiler water. They usually included specially formulated chemical reagents in the form of small powder packets.

3. Category:Hardness tests - Wikipedia

   en.wikipedia.org/wiki/Category:Hardness_tests

   Tablet hardness testing; Turner-sclerometer; V. Vickers hardness test This page was last edited on 16 March 2013, at 18:53 (UTC). Text is available under the ...

4. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .

5. Indentation hardness - Wikipedia

   en.wikipedia.org/wiki/Indentation_hardness

   Brinell hardness test (HB) BHN and HBW are widely used [7] Knoop hardness test (HK), for measurement over small areas, widely used to test glass or ceramic material. [8] Janka hardness test, for wood; Meyer hardness test; Rockwell hardness test (HR), principally used in the USA. HRA, HRB and HRC scales are most widely used.

6. Vickers hardness test - Wikipedia

   en.wikipedia.org/wiki/Vickers_hardness_test

   The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. [1] The Vickers test is often easier to use than other hardness tests since the required calculations are independent of the size of the indenter, and the indenter ...

7. 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]

8. 6 of the Most Common Home Renovations — Are They Worth It ...

   www.aol.com/finance/6-most-common-home...

   With home prices still on the rise in every region of the U.S., 63% of homeowners say they'd rather remodel their homes than move to renovated homes, according to an October survey by Clever Real...

9. Carbonate hardness - Wikipedia

   en.wikipedia.org/wiki/Carbonate_hardness

   Carbonate hardness, is a measure of the water hardness caused by the presence of carbonate (CO 2− 3) and bicarbonate (HCO − 3) anions. Carbonate hardness is usually expressed either in degrees KH (from the German "Karbonathärte"), or in parts per million calcium carbonate ( ppm CaCO 3 or grams CaCO 3 per litre|mg/L).