Checkline DT-200LR [DT-207LR] Contact / Non-Contact Tachometer With LED Display And 6 In Circumference Wheel. DT-200LR models fefature an improved laser dot that is brighter and smaller then the previous model allowing use on a smaller “target” (refl ective tape) and for measurement from greater distances. The screw-in contact adapter makes it quick & easy to convert from non-contact to contact operation.