The Zircon ExitPoint XL300 is an electronic through-hole drill guide designed to quickly and accurately detect exit points before drilling and coring, without the need to manually measure. This is particularly vital for cable and wire installers and concrete scanners, enabling them to locate a precise exit point through walls, floors, and ceilings. This effective tool saves time and money by reducing guesswork, rework, and unnecessary holes. The ExitPpoint XL300 scans through most types of non-magnetic building materials, such as wood, drywall, gypsum panels, bricks, and poured concrete. It features 2 scan modes: normal scan works through conventional interior walls up to 4. 53 inches (11 cm) thick and deep scan mode scans through materials up to 11. 8 inches (30 cm) thick. Compact and all-inclusive, the ExitPoint includes a handheld receiver that features a bright red and blue 10-LED display and audio Buzzer. It also includes 2 transmitter magnets (small and large), 9 reusable adhesive discs to mount the magnets, a protective storage case, and 3 AAA batteries. Easy to use, simply affix the transmitter magnet on the location to be drilled with an adhesive disc. Then scan the vicinity of the other side of the wall with the handheld receiver. The exit point works by detecting the signal of the transmitter magnet. When the receiver is near the center of the transmitter, the display will light red, indicating a strong signal. Slowly scan left, right, top, and bottom to determine the precise location. Backed by our world class customer service and support, we at Zircon know that whether you're a construction professional or weekend DIY enthusiast, you'll find the Zircon ExitPoint XL300 has the technology and durability you're looking for to get the job done right.