4 independent channels, each of which counts up or down for any interval from 1 second to 100 hours. Extra large display indicates channels in use. Each one has a distinctive 1-minute alarm. Automatically begins to count up to indicate time elapsed after count down reaches zero. Memory recalls last timer setting for reuse. Also has a clock mode. Has a stand, pocket clip, and a magnet. Dimensions: 2-7/8" x 2-1/2" x 9/16". Traceable® Certificate is provided. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology).