Traceable QC timer. Ideal QC (quality control) countdown and alarm timer combines easy, 3-button operation with giant-size digits. Learn its operation in less than 10 seconds without ever opening the directions. 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). Documentation provides the accurate timing assurance demanded by government regulations, ISO 9000 requirements, and QC needs. Times may be set up to 20 hours in any minute increment. At zero, a 1-minute alarm sounds. Three-quarter-inch-high digits are readable from 20 feet. Supplied with 3-year AAA battery, magnet, clip on back.