It got rained on, snowed on, tossed in the back of my SUV countless times, and on a couple of occasions had sand thrown into it by bullet impact. It was not perfect. It relied on cardboard aiming guides that you had to insert in slots in the top of the case, and if the sun was out you had to fit plastic shades onto the top of the aiming guides. If a gust of wind came along the shades blew off, and sometimes the guides blew off. If you were not careful to place the chronograph at least a dozen feet from the muzzle, the blast would blow off the aiming guides.