Feature: 1. Built in Sensing Coil: The underground pipeline handheld detector is equipped with a built in sensing coil, can receive magnetic signals from the pipe, the coil generates an induced current to calculate the direction and position of the transmitter. 2. Wide Application: The underground pipe locator is suitable for water supply pipes, cable pipes, underground construction, cave exploration, underwater research, and more. Use it for efficient exploration work. 3. LED Screen Display: The water supply pipe locator comes with an LED screen, providing clear and convenient monitoring data. Enhance your exploration experience with this practical feature. 4. High Accuracy: The 512Hz transmitter allows easy determination of probe location. The receiver features a separated tilt sensor to obtain peak and zero signals, ensuring effective exploration. 5. Sturdy Construction: Made from premium ABS material, the pipeline blockage locator is sturdy and water resistant, suitable for underwater measurements, ensuring long lasting use. Specification: Item Type: Underground Pipe Locator Working Frequency: 512Hz Modulation: None Battery: 6 x AA Batteries (Not Included) Usage Time: 4 Hours Intermittent Use Sound Output: 50-1000Hz Depending on Signal Strength Operating Temperature: -20?? to 60?? Assembled Length: Approx. 535mm / 21.06in Sensor: Separation angle sensor for peak and zero signal acquisition Weight: Approx. 1805.00g / 63.67oz. Package List: 1 x Detector 1 x Detector Accessories 1 x User Manual 1 x Earphone 1 x Aluminum Case Note: 512 has only one mode, the 'detector' mode. In detector mode, the receiver searches for signals transmitted by a small probe or camera with a built in transmitter that is wired through pipes. The detector must emit a 512Hz signal, and the receiver can determine the approximate depth of the target. First, turn on the receiver, walk around keeping the receiver at waist height, then walk towards the general direction of the transmitter while slowly sweeping the receiver backwards while pointing towards the transmitter. You will notice the signal getting stronger. As you get closer, adjust the sensitivity as needed to keep it within range. When you cannot keep the meter below full scale, switch to 'near' and continue moving towards the direction of the stronger signal. When you reaching the point where the signal seems strongest, moving in any direction will weaken it, and then you know you have found the detector directly below the antenna pole. Move to another location, search for this peak signal again, see if you always return to the same spot for confirmation. If you correctly perform each step, you should consistently find yourself right above the transmitter each time. Keep practicing until you get consistent results. The product does not include a transmitter and requires a 512Hz transmitter to be used.