The DT-107A-S12 tachometer provide outstanding accuracy in measuring speed and direct linear length via a 12" wheel. The larger wheel rotates more slowly than a standard 6" wheel, thus enabling confident and safe high speed measurement. One year warranty. Multi-mode speed selection provides optimum versatility via 16 selections. Extremely accurate fully meets the strictest tolerances. All-metal construction have exceptional durability; withstands harsh usage. Direct length measurement offers value/versatility via additional applications. 12" Calibrated wheel facilitates direct interpretation of speed/length without arithmetic calculations; enables high speed measurement. Large 5 digit display permits easy reading. Wide speed range (0.10 - 25,000 RPM) allows usage in almost limitless applications. Longer operating times are achieved with long battery life (40 - 65 hours). Large 10 test memory capacity (selectable to 5 minutes or more) permits thorough equipment/process inspection. Total revolution display enables rotation counting during process analysis. Free N.I.S.T. certificate facilitates easy compliance with regulations. CE mark compliant with applicable EU directives. Minimum shaft loading overspeed protection avoides potential instrument damage.