Digital timers may “count up” (like a stopwatch) to measure the time elapsed or “count down” from a set time to indicate the time remaining. The length of time that can be measured will depend on the timer. Other digital timer features include:

• Channels: May measure a single time interval or have multiple channels to track two or more time intervals separately and simultaneously
• Alarms: May be audible or visual or both; alarms may sound for a specific period of time before stopping or until the user manually stops them
• Memory: Saves the last settings entered
• Time-of-Day Clock
• Display: Typically lit via LED; may have larger numerals that can be easily seen from a distance
• Durability: Some models are waterproof, shockproof, or water- or shock-resistant

Some digital timers are certified, which requires calibration and testing by an accredited laboratory. This is usually traceable to NIST™ standards.

Many digital timers are portable and powered by replaceable batteries. They may include an easel stand, a magnet, a lapel clip, or a hole for a lanyard.

Some are electrically powered and may have a receptacle for an equipment plug so the timer can automatically turn the equipment off at specific times or intervals.