Amazing device - Kestrel 5500 Weather Meter with LiNK +Vane Mount

This tiny weather station has too many features to list in this review. If you get the version that has a wind vane and the Link feature, you can feed the info off this device straight into a ballistic calculator. Using the mobile app you can feed info from the mobile device into the station (time, altitude and such). It does take a few minutes to let the station acclimate to the ambient conditions. Only one AA battery powers the station and battery life isn't terribly long. The station feels well made in every way. Watertight seals on the battery compartment, splashproof buttons, and so on. I've used it to compare the readings I get on my professional stationary weather station and the results are spot on. Since the barometer relies on the altitude data you provide there is some confusion on how to set this feature up. If you need portable weather data, I can't imagine a better way to get it. I do recommend that you use the wind vane feature when possible as it also reduces the impact (like body heat) that holding the device has on its readings. A portable tripod is required to mount the wind vane. If you're using a Strelok ballistic calculator (the Pro version) you can see what your scope image should look like for prevailing conditions (crosswind, and atmospheric conditions) in real time. A big deal for long range shooters.