Our simplified version, yet built to the same demanding specifications as the original FastMeasure FM1. For a few dollars more than a good measuring wheel, you can install the DS on anything that rolls at lower speeds (ATVs, stripers, grinders, small or large machines) for accurate and reliable measuring. No power source is required from the host vehicle so it makes installation very easy. The DS is ideal for thermo hand lines and striping machines. DS uses a long range magnetic sensor for simple installation. An optional backlit display package is available for the DS for an additional $45.00.