The IEC 'Multi-Timer' has been a favourite lab.timer for Physics. It is microprocessor controlled for extreme accuracy and runs from 3x 'AA' dry cells. If buttons have not been pressed for 2 to 3 minutes, it turns off. When re-powered, all readings and memories are restored. The 'Genius' timer LB4055-001 can calculate velocity and acceleration and runs 2x external devices simultaneously, but the 'Multi-Timer' cannot calculate and runs only one external circuit, however 2x Photo Gates can be used for starting and stopping the timer in different modes (see PDF file). Auto ranging permits times up to 1.9999S with a resolution of 0.1mS, 19.999S by 1.0mS and 199.99S by 10mS. The 20 memories can be averaged, totalled, purged or cleared. This rugged timer is very fast, is safe in the hands of students, is low cost and offers a good range of functions.