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The Ditch Witch offers an electronic locating system, the Ditch Witch 720ML. Designed for ease of use and engineered to be extraordinarily sensitive, the 720ML can detect signals given off by marker stakes, manhole covers, valve boxes, cast-iron pipe, and other metallic objects in areas designated for excavation or horizontal directional drilling. The 720ML has only two controls, located under the cover, so it can be easily operated with one hand. Its easy-to-read, digital bar graph displays signal strength and polarity to help pinpoint the target, and the operator has a choice of two audio modes. Four sensitivity settings allow the operator to customize the 720ML to suit soil conditions. The lightweight 720ML is easy to use for extended lengths of time, and two 9-volt lithium batteries keep it operating for more than 60 hours.