. DepthTraxDT1H Handheld Depth Finder will give you instant depth readings from 2-1/2 to 300 feet.The trouble with most depth sounders is that they can only see what's in a fairly narrow cone directly under your boat. However, the ultralight handheld DepthTrax DT1H lets you aim its beam wherever you want to see, like an underwater flashlight.One slide of the magnetic switch gives real time depth readings, while a second slide will indicate the current water or air temperature. Algorithmic programming virtually eliminates false readings while Shoot Thru Technology allows readings through ice and solid fiberglass or aluminum boat, kayak, or canoe hulls.The impact resistant housing includes a wrist strap and the unit floats if dropped overboard. Since it is submersible to 150' you can use it as a range finder while snorkeling and diving.Key FeaturesDepthTrax Intelligent Sonar delivers precise depth readings up to 300 feetAir and water temperature readings in C or FBacklit liquid crystal displayAutomatic gain and sensitivity adjustmentShoot-Thru TechnologyTM allows readings through ice and boat hullsMagnetic On/Off switch (no external metal parts)Impact resistant and floatsDiver designed waterproof range finder to 150 foot depthsDisplay Type: Backlit Liquid CrystalWaterproofing: IPX8 (to 150')Operating Temperature Range: -10 to 160FDepth Range: 2' to 300'Transducer: Integrated in bodyFrequency: 200 kHzBeam Angle: 20 DegreesBattery Type: One 9V battery (sold separately)Dimensions: 8"L x 2"W x 2"HWarranty: Two years