Chelsea Filter Digital scales - regular lines - resolution 0.1g 3) Place probe on disc

3) Place probe on disc (provided) and wait for 'initialisation'

longer working distances)

this applies to all simple lenses (i

That is why it is so difficult to tell them apart

Chelsea Filter Digital scales - regular lines - resolution 0.1g 3) Place probe on discSummary 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