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2. Scleroscope - Wikipedia

   en.wikipedia.org/wiki/Scleroscope

   A scleroscope is a device used to measure rebound hardness.It consists of a steel ball dropped from a fixed height. The device was invented in 1907. As an improvement on this rough method, the Leeb Rebound Hardness Test, invented in the 1970s, uses the ratio of impact and rebound velocities (as measured by a magnetic inducer) to determine hardness.

3. Sclerometer - Wikipedia

   en.wikipedia.org/wiki/Sclerometer

   The Turner-Sclerometer test consists of measuring the amount of load required to make a scratch. [1] [2] In test a weighted diamond point is drawn, once forward and once backward, over the smooth surface of the material to be tested. The hardness number is the weight in grams required to produce a standard scratch.

4. Scratch hardness - Wikipedia

   en.wikipedia.org/wiki/Scratch_hardness

   Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. [1] Attempting to scratch a surface to test a material is a very old technique. [2]

5. The best coupon apps and how to use them - AOL

   www.aol.com/finance/best-coupon-apps-them...

   RetailMeNot is a popular coupon app offering various deals, coupon codes and cash-back offers. You can search for discounts by category, such as clothing or travel, or by retailer.

6. Shortcuts.com has printable coupons - AOL

   www.aol.com/news/2010-05-04-shortcuts-com-has...

   To get printable coupons on Shortcuts.com, plug in your zip code. When I entered mine, 48 coupons popped up. If you are looking for more grocery coupons, check out Coupons.com , SmartSource , or ...

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Hardness - Wikipedia

   en.wikipedia.org/wiki/Hardness

   The principle is that an object made of a harder material will scratch an object made of a softer material. When testing coatings, scratch hardness refers to the force necessary to cut through the film to the substrate. The most common test is Mohs scale, which is used in mineralogy. One tool to make this measurement is the sclerometer.

9. These are the best Amazon deals of the week: AirTags, iPads ...

   www.aol.com/lifestyle/amazon-best-deals-01-14...

   We tracked down the week's best deals at Amazon, including an iPad that's $100 off and a range of beauty products that are marked down.