Ultrasonic level sensors produce analog outputs that offer actual distance measuring, by offering a 4-20 mA or 0-10 Vdc variable output dependant on range to the target. This output can easily be converted into useable distance information. Often used in continuous level detection, ultrasonic level sensors may even be used when the device cannot be mounted directly over the target material. The sound waves for the ultrasonic level sensor can be bounced off a flat hard surface mounted over the tank on a 45-degree angle. It will bounce off the substance in the tank and then reflect from the 45-degree "reflector" back to the sensor. There are many applications for ultrasonic level sensors.