This all-in-one instrument accurately and silently performs all timing functions required for testing. To use as an interval timer, simply set an interval up to 100 minutes and it will count down in minutes and seconds until that interval has expired. An electronic beep sounds when the preset time is up. Or, functioning as a stopwatch, it runs until stopped... up to 60 minutes, at which point it automatically recycles. As a stopwatch, it also includes a time-out feature, which allows you to interrupt and resume timing. This pocket-sized (2 1/3" x 2 1/2" x 1/2") unit is lightweight, easy to use, and all numerals in the digital display are large and easy to read. It uses a AAA battery (included) and is designed for extra-long battery life. This valuable and reliable electronic unit will find many uses in any assessment setting. Uses magnet, clip-on, or easel stand.