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Knob Magnet, Neodymium

5
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Summary Material: standard, neodymium Shape: round magnet on wooden knob Size: - magnet 20mm X 10mm - total height including the wooden knob, 40mm Amazingly powerful for the size, nice to hold, nice to use Strength How many sheets of paper will this magnet hold securely onto a fridge door? Answer: 43 The paper was 90g in weight (a good quality paper, not standard copy paper) and was A4 in size.  Uses for testing Gold and silver are not magnetic. So when you are presented with dozens of items to test, save time by picking out all the items that are magnetic. This does NOT mean that there are special magnets for testing gold and silver. If an item is NOT magnetic, it could be any one of hundreds of metals (including gold and silver). Silver is strongly 'diamagnetic'. If you slide an appropriate magnet down a flat silver surface (e.g. a coin) it will move slowly instead of 'falling off'. Copper is slightly diamagnetic. See our 'magnets for silver testing' - a set of 3 magnet, a sample copper coin and instructions. Copper is not magnetic, neither is brass (a mixture of copper and zinc) or bronze (a mixture of copper and mostly tin). A magnet is useful because many copper / bronze / brass items are really steel that has been plated and will (in most cases) be very magnetic. As with gold and silver: if an item is magnetic it is not solid copper / bronze / brass. Samples Not sure which magnet to buy? We have a bargain sample pack of nine different magnets (both neodymium and iron), click here.

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Displaying all 12 reviews
Trusted Customer
4 months ago
Date of purchase: 02/04/2025
Knob Magnet, Neodymium
Trusted Customer
2 years ago
Date of purchase: 02/11/2023
Knob Magnet, Neodymium
Does exactly what I needed.
Trusted Customer
9 years ago
Date of purchase: 02/27/2016
Knob Magnet, Neodymium
Now I must remember to keep it well away from my laptop, etc. (as warned by yourselves to do - useful information for those who maybe would not have thought of it).
Trusted Customer
10 years ago
Date of purchase: 01/20/2015
Knob Magnet, Neodymium
Trusted Customer
11 years ago
Date of purchase: 04/03/2014
Knob Magnet, Neodymium
Trusted Customer
11 years ago
Date of purchase: 02/07/2014
Knob Magnet, Neodymium
Trusted Customer
11 years ago
Date of purchase: 10/28/2013
Knob Magnet, Neodymium
Trusted Customer
11 years ago
Date of purchase: 10/12/2013
Knob Magnet, Neodymium
Good
Trusted Customer
11 years ago
Date of purchase: 09/26/2013
Knob Magnet, Neodymium
knob magnet strong and safe to use. thank you quicktest. good product !
Trusted Customer
12 years ago
Date of purchase: 05/20/2013
Knob Magnet, Neodymium
Great product exactly as described
About Quicktest
Our products help you buy, value and sell at auctions and fairs, in the shop, or trading online. We are experts in chemical and electronic test equipment and supply most pawnbrokers, precious metal traders and jewellers in the UK.
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Unit B, Greenhill House, 26 Greenhill Crescent, WATFORD, WD18 8JA, United Kingdom
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About Quicktest
Our products help you buy, value and sell at auctions and fairs, in the shop, or trading online. We are experts in chemical and electronic test equipment and supply most pawnbrokers, precious metal traders and jewellers in the UK.