TACHOMETER The laser-enabled DT-207LR has precise RPM measurement up to 20 feet. The Series DT-207LR digital tachometers incorporate laser technology yet retain our hallmark rugged construction and reliable quality components. Units offer incredible value and versatility as they can operate in non-contact and contact applications. These instruments feature a field-upgrade-able contact adapter for linear rate measure, conveniently allowing both non-contact and contact measurements. Incorporating the precise laser technology and user-friendly functions as the DT-207LR tachometer, the DT- 207LR-S12 provides an exceptional accuracy in measuring speed and length via its 12” wheel. The larger wheel rotates more slowly than a standard 6” wheel, enabling reliable and safe registration of high speeds. Features:  Outstanding Accuracy allows usage in the strictest applications Sophisticated laser beam detection to 20 feet provides operator safety during testing Exceptionally rugged die-cast aluminum housing enables usage in the harshest conditions Wide field selection of units in both instantaneous rate as well as totalized length satisfies a multitude of user requirements Large 5 digit display aids user visibility 10 measurement memory capacity allows quick retrieval of stored data plus additional last, max. & min. values Long-life battery ( 25-40 hrs. continuous use) eliminates concerns of being down during testing Compact, Ergonomic design allows easy ergonomic grip Rear Threaded Inserts provides option to mount to stand or other device Available display options of either LCD or vibrant, bright red LED CE Mark combined with free NIST certificate provides a guarantee of quality performance Includes:  Reflective tape Cone adapters Funnel adapter Master wheel ( 6" cir.)  3.5" extension shaft 200LR adapter Carrying case AA 1.5V batteries NIST certificate 1 Year Warranty User Manual