ELMA MW-1BLK-RGB Multiwheel Black RGB Miniature Encoder 8+1 Joysti...

Black - A colour which does not emit any colour of the spectrum. Black absorbs all frequencies of the spectrum.

Diameter - A measurement across a circle passing through the middle

8-bit - 8 integers or data units. An 8-bit processor can acess 8-bits in a single operation.

Colour - The categorised spectrum of light visable to humans

disc - A round flat object often used in reference to a computer storage media

Rotary - something that revolves around an axis, for example an engine.

Rapid have established themselves as a leading online supplier of electrical products, cables, tools, electrical components and educational resources. Through their website you can purchase a variety of meters and resistors, batteries, electrical sockets, fuses and circuit breakers, communications cables, miniature power tools, small hand tools, rivets, tapes and adhesives, office equipment and educational books and equipment. As well as selling to the general public their extensive product selections means they also sell to trade customers. They also have great links with educational customers supplying products to many schools, colleges and universities. They also offer a great turnaround on delivery meaning that your products can be with you the very next day. Some of the top brands that they stock include Recom, Draper, Bosch, Hammond, Duracell, Kingbright, Arcol and Neutrik.