The I/O 24 ULN2803 Switch Board is a very useful accessory board that allows much higher voltage and current devices to be interfaced to the low level logic provided by the Elexol I/O 24 modules. Made by Elexol.
The MGS1600GY is a sensor capable of detecting and reporting the position of a magnetic field (typically magnetic tape on the floor) along its horizontal axis. Includes a built in Gyro. Replaces MGS1600 TS-072-000