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2X and 2X with a working distance somewhere between 250 and 350mm (10 to 14 inches)
longer working distances)
- brightest for 5 hours (3 hours at its very brightest then 2 hours not quite so bright)
mix-and-match clearance items)
Chelsea Filter Digital scales - regular lines - resolution 0.1g 2X and 2X with aSummary The original Chelsea Filter, as developed at the Chelsea College of Science and Technology in 1934. Do not confuse this with the many copies. Detail Many stones appear to change colour when viewed through the filter. Originally designed for detecting synthetic emeralds, nowadays the Chelsea filter is an invaluable aid to identifying many other gemstones. It can give an indication that you have an emeralds and aquamarines, though not a
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