This versatile low voltage Timer has a bright red digital display for classroom work. It is compact version and is run by 240/12V.AC PlugPak (not supplied). This model is very similar to the 4064101 but is lower cost because it has no power for Photo Gates or automatic solenoid ball release control for the 'Free Fall' experiment. Timer is microprocessor controlled and is very fast. Autoranging permits times up to 99.9999S by 0.0001S and up to 999.999S by 0.001S. Selectable modes are: Start/Stop, PhotoGate, Period and Pendulum. Stores 20 memories that can be added, averaged, purged or cleared. see the PDF file for full details. Refer also to 4064101 and 4064201 for variations to this model.