I’m impressed with this anemometer, as it is easy and straightforward to use, and you can easily switch between different units of measure. At first, I had trouble getting the battery compartment open, until I realized the meter is actually housed in a red over-molded rubberized cover. Once you remove the meter from the cover, you can access the battery compartment.I’ll be using this for several applications; out kayaking to know when it is safe, on the range to compensate for long range shots, See full review