I am searching for a laser pointer that, pointing the water surface from around 5-10 meter, is clearly reflected by water surface so that we can see and identify the illuminated dot on the water surface. It means that the laser doesn't have to penetrate the water body but has to be reflected by the surface. Of course for clear water that is very difficult, but for turbid water as water in rivers or lakes it is surely possible. Any suggestion in terms of wavelength, laser model and brand, power (it must be below 100 mW)? I am also searching something that is expected to work even in cold climate (around 0-4° degree).