My fishing buddy has an older model hand-held depth finder, bought about 15 or 20 years ago. It looks pretty much like a flashlight, I think it is called Polar something, but not certain on that. At any rate, it gives depth to the bottom very accurately and since he's had it so long it has certainly proven reliable over the years. We use it every ice-fishing trip. You do need relatively clear ice, and a small layer of water to form a bridge between the depth finder and the ice... other people's frozen-over ice fishing holes are very reliable places to measure. It has proven invaluable for finding the depth to the bottom, particularly for locating features like drop-offs where depth can change quickly over short distances and setting up right on the drop off can be the key to good fishing.
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