Surface & Hardness Testing - Page 15

Manufacturer: BEST JEWELRY SUPPLY Brand: Best Jewelry Supply

This set is the best available this is made of high quality metal and has 4 different karats 10k,14k,18k & .999s The needles and the item to be tested are rubbed on a test stone and treated with acid to determine a match. All Gold Test Needles are not created equally. Gold test needles are gauges /bench marks to compare unknown gold objects for color reference when using acid or premixed gold test solutions to determine their gold content. Needles are also a necessity for checking premixed test solutions for accuracy and to make sure they have not deteriorated over time. If the test needles are not the correct alloys they will not give you the correct reading. Over the last several years I have noticed that all of the test needles available seem to be imported and are not of the correct alloy. This makes them almost worthless in testing unless you are very knowledgeable on the subject and know how to compensate for the inaccuracy of the import needles. I am not implying that the imports are not marked correctly.I am saying they are not alloyed to mach 8k through 22k gold that most gold jewelry is made of . 14k gold consists of 58.8% gold, about 12.8% silver, 22.9% copper, 3.5% zinc, and .2% cobalt. It is this writer's belief that copper is substituted in lue of some or all of the silver in the imported test needles and for that reason their marks are more copper colored. I have a lot of customers call me and want 8k and 12k solution. I suggest they purchase a set of correctly alloyed test needles then they could identify 8k or 12k gold by applying 10k or 14k solution and will be able to see the slight change in color of the test mark when compared to the 8k or12k test needles. This is not possible if using the imports because the mark is copper tinted before a solution is applied. It is important to recognize that test needles are the heart of any test system that uses acid solutions to test for gold content.

Manufacturer: BEST JEWELRY SUPPLY Brand: Best Jewelry Supply

This set is the best available this is made of high quality metal and has 4 different karats 10k,14k,18k & .999s The needles and the item to be tested are rubbed on a test stone and treated with acid to determine a match. All Gold Test Needles are not created equally. Gold test needles are gauges /bench marks to compare unknown gold objects for color reference when using acid or premixed gold test solutions to determine their gold content. Needles are also a necessity for checking premixed test solutions for accuracy and to make sure they have not deteriorated over time. If the test needles are not the correct alloys they will not give you the correct reading. Over the last several years I have noticed that all of the test needles available seem to be imported and are not of the correct alloy. This makes them almost worthless in testing unless you are very knowledgeable on the subject and know how to compensate for the inaccuracy of the import needles. I am not implying that the imports are not marked correctly.I am saying they are not alloyed to mach 8k through 22k gold that most gold jewelry is made of . 14k gold consists of 58.8% gold, about 12.8% silver, 22.9% copper, 3.5% zinc, and .2% cobalt. It is this writer's belief that copper is substituted in lue of some or all of the silver in the imported test needles and for that reason their marks are more copper colored. I have a lot of customers call me and want 8k and 12k solution. I suggest they purchase a set of correctly alloyed test needles then they could identify 8k or 12k gold by applying 10k or 14k solution and will be able to see the slight change in color of the test mark when compared to the 8k or12k test needles. This is not possible if using the imports because the mark is copper tinted before a solution is applied. It is important to recognize that test needles are the heart of any test system that uses acid solutions to test for gold content.

Brand: DigiWeigh/PuriTEST

Digiweigh 100AS Scale and PuriTEST six bottle test solution set

Manufacturer: Everbuild Brand: EveRBUILD Model: ROLLHARD20-EBD

Roll and Stroll Hard Surface Protector is the ultimate self adhesive hard surface protection system

Brand: PuriTEST Color: black

Very easy to use and includes instructions. Sealed box contains six (6) bottles test solution; each bottle contains 1/2 fluid oz (0.50 fl oz) test acid. You will receive one 10k solution, one 14k solution, one 18k solution, one 22k solution, one Silver solution, and one Platinum solution--each new in box sealed with shrink-wrap. Test stone and files are brand new, and will last many uses. Test stone measures 2" x 2" (inches), and the files measure 5.5" (14cm); files come in a variety of shapes (see photograph). DigiWeigh 100AS jewelry scale retails for $79.00! Just check the DigiWeigh site and see for yourself. This sacle enables you to choose from Grams (g), Ounces (oz), Carats (ct) and Grains (gr/gn)... Capacity/Accuracy: 100/0.01 g, 3.527/0.0005 oz, 500/0.05 ct, 1542.8/0.2 gr. This electronic scale is perfect for loose diamonds & gemstones, scrap jewelry, coins, small postal shipments, and much more. Unique gift idea for anyone even remotely interested in precious metals, scrap jewelry, cash-for-gold trade, and other such hobbies/professions. Excellent value.

Brand: PuriTEST Color: black

Appropriate for appraisal. Very easy to use and includes instructions. Sealed box contains six (6) bottles test solution; each bottle contains 1/2 fluid oz (0.50 fl oz) test acid. You will receive one 10k solution, one 14k solution, one 18k solution, one 22k solution, one Silver solution, and one Platinum solution--each new in box sealed with shrink-wrap. Test stone and file are brand new, and will last many uses. Test stone measures 2" x 2" (inches) diameter, and the file measures 5.5" (14cm) in length. DigiWeigh 100AX jewelry scale retails for $79.00! 100 x 0.01g. Enables you to choose from Grams (g), Ounces (oz), Carats (ct) and Grains (gr/gn). Scale capacity/Accuracy: 100/0.01 g, 3.527/0.0005 oz, 500/0.05 ct, 1542.8/0.2 gr. This electronic scale is perfect for loose diamonds & gemstones, scrap jewelry, coins, small postal shipments, and much more. Use the FREE solid silver and gold samples and gold-clad replica bar to demonstrate test/weigh procedures, or simply keep as investment. Very easy to use. Popular among professionals, hobbyists, coin enthusiasts, business owners, and students alike. Unique Gift Idea. Excellent tools. Excellent Value.

Manufacturer: Century Brand: Century

Century 24035 RS SET

Manufacturer: Ukrainian Diamond Tool Brand: Ukrainian Diamond Tool

Diamond Microhardness Indenter Rockwell 0.17-0.20 carat Made in Ukraine.

Manufacturer: Mars International Brand: Mars

Mars International Tablet Hardness Tester MANSANTO TYPE

Manufacturer: Flexbar Brand: Flexbar

Grind and Turn Comparators. Made in U.S.A. 4 Models - inch and Metric. Made of Solid Nickel. Furnished in attractive vinyl Case With instructions. Each Model has 10 specimens: 5 each internal Diameter (concave) and 5 each Outside Diameter (convex) Cylindrical Turning Comparator 10 Specimens - (shows I.D. and O.D.) 5 each I.D. (concave) 16, 32, 63, 125 and 250 Ra 5 each O.D. (convex) 16, 32, 63, 125 and 250 Ra Model No. 16041,Cylindrical Turning Comparator (in Microinches)