Thomas 5041 Traceable Key-Chain Timer, 1.5" Width x 2" Height x 0.75" Thick

Unique timer is easy to use. Counts down, alarms, and functions as a stopwatch. One of the handiest timers ever designed- holds your keys or hooks onto your lab coat buttonhole. Four-digit LCD display always shows time remaining in hours and minutes. Program it in the countdown mode in minute increments from 20 hours to 1 minute. When zero is reached, an alarm sounds for 60 seconds, or it may be silenced manually. In the stopwatch mode, it times from 1 second to 20 minutes and then repeats itself. Also has a time-out feature in both up and down counting. Big-digit, 1/3" high display is easy to read. Three-button operation is fast and intuitive. Stopwatch operation takes just the press of a single button. Designed for rugged use. Quartz-crystal accuracy is 0.01 percent. To assure accuracy an individually serial-numbered Traceable certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). Key-Chain Timer has a rugged, chemical-resistant ABS case, and a 1.5-year, continuous-use, replaceable silver-oxide battery. Measures 1.5" width by 2" height by 0.75" thick. Weight is just 0.75 ounce.