The Global Specialties RDB10NIST Resistance Decade Box with NIST Certificate is a handheld resistance decade box that creates a specific resistance value using a combination of 28 switches. All switches clearly display a visible white dot when in the on position. Designed with accuracy to meet the needs of industry and education alike. The RDB-10 is a compact, convenient tool for engineering design and testing as well as calibration of test equipment. Includes certification traceable to NIST.