This four channel timer has a built in white board and dry erase marker with eraser tip that helps keep track of time and other critical information. Each channel has an audible alarm, a switchable timing capacity of 23 hours: 59 minutes or 59 minutes, and last time set memory. It programs in hours/minutes and displays in hours/minutes/seconds. Up or down counting is possible, and elapsed time after countdown is displayed. A key press confirmation feature gives an audible indication of data entry. Lay flat on a bench, use the flip-open stand for a vertical view, or use the magnetic back for metal surface attachment. Requires two AAA batteries (included). Features a Certificate of Calibration and individual serial number, these electronic timers are tested and calibrated in H-B’s exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory (Cert #2448.01), against equipment whose calibration is traceable to NIST. CE marked, RoHS compliant. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.