4 independent channels each of which counts up or down for any interval from 1 second to 100 hours, plus clock button. 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 or reuse. Also has a clock mode. Has a stand, pocket clip, and a magnet. Comes with one button cell battery LR44. N.I.S.T. traceable Certification Report available. Sper Scientific 810015 Digital Count Down / Count Up Timer with Clock – 5 Channel. 4 independent channels each of which counts up or down for any interval from 1 second to 100 hours, plus clock button. Count Up Channel: 4 Count Down Channel: 4 Range: 100 Hours Resolution: 1 Second Dimensions: 2 x 21⁄2 x 9/16Weight: 2 oz *Certification Option N.I.S.T. traceable Certificate of Compliance available at additional cost Select option above. Downloads Instruction Manual Product Brochure Comparison Chart Comparison Chart