H-B DURAC 3-Channel Electronic Timer and Clock with Certificate of Calibration (B61700-3200) Three channel timer keeps track of three events at the same time Clock can be switched to 12- or 24-hour format Counts either up or down; remembers last time set Lay flat on a bench, use the flip-open stand for a vertical view, carry it with the convenient pocket clip, or use the magnetic back for metal surface attachment Traceable to NIST; previously H-B Instruments #575; Timer Accuracy-  3 seconds/day