TryThat TimeCalculator is a speciality calculator that will make your time calculations easier and more reliable. Use for calculating time sums and differences; add and subtract hours:minutes:seconds. Calculate time cards and/or hours worked; times for filling up recording media (audio tapes, CDs, etc); total a series of times splits for sports events or science projects. Calculations can be done in seconds, 1/10th, 1/100th and 1/1000th of a second. You can convert between the various units of time. It has 10 memory locations, the names of these locations can be edited, to make calculations easier.