Some companies that make classroom timers include Lux, TimeTimer and Really Good Fluency. These manufacturers offer products that are available for purchase via the ReallyGoodStuff.com website, as of June 2015. Other manufacturers of classroom timers are Time Tracker, Learning Resources and Timer Tools.
The Lux Minute Marker is a multi-function timer that includes a memory feature that saves the last setting and a large display with easy-to-read digits. It counts up as well as down, can be set for up to 99 minutes and 59 seconds, has magnetic belt/apron clip or a stand for table-top use, and a loud alarm.
Time Timer makes alarm-clock shaped timers that come in sizes ranging from 3 to 12 inches, and each features a large red indicator that marks the passing of time. This enables students to quickly and easily see how much time is left for a test or other timed event. These timers can be set to either silent or audible mode which beeps when time expires.