This countdown and alarm timer combines 3-button operation with large-size digits for easy viewing. Times may be set up to 20 hours in any minute increment. At zero, a 1-minute alarm sounds. Timer includes a Traceable® certificate (issued by an A2LA-accredited, ISO 17025-certified lab), which documents traceability to NIST standards. Dimensions: 3-1/2" x 2" x 1/2". Weight: 2 oz.