Unique high end RGB Photomultiplier colour scanner array, which consists of: incoming light beam lens, 3 adjustable colour light splitters (semi mirrors) , 3 color filters (RGB) and 3 photomultipler tube holders (ready wired with resistors and caps) on adjustable mounts. all sub assemblies mounted on a massive solid billet of aluminium. Please note , comes without tubes, these can be bought separately : see associated product tab for R446 tube. please call if you would like further information...... yes, this technology is still prefered in some applications. Selling for £150, this would take an expert metalworker a week to design and make this, so originally probably cost many thousands of pounds. weight about 4KG ( 5KG when properly packed for despatch.) note UK carriage will be subsidised at checkout.