Infrared sensors are used to monitor the distance to an object, relative to the sensor, when contact cannot be made with the object. This makes them ideal for use in setting up the suspension by monitoring chassis ride height in relation to the moving ground plane. Infrared Ride Height sensors and modules are commonly attached to the V-Net cable of any V-series recorder. If desired, they can also be attached to the analog port by using an Interface module rather than a V-Net module. These sensors are designed for use in measuring distances ranging from 3.93 to 15.75 inches. Each sensor must be used with the appropriate V-Net module.