The 840 breadboard is an invaluable tool for experimenting with circuit designs whether in the R and D or university lab. A breadboard is used to make up temporary circuits for testing or to try out an idea. No soldering is required so it is easy to change connections and replace components. Parts will not be damaged so they will be available for re-use afterwards. The device can accept transistors, diodes, LEDs, resistors, capacitors and virtually all types of components. Besides that, it is fit for jumper wire of 0.8mm diameter with standard 2.54mm hole spacing.