This light meter can use either reflective or ambient light in taking a reading. It can be used in most lighting conditions and really helps to take the guesswork out of coordinating the proper f-stop setting for the shutter speed that you choose with your camera. It is dust-proof, splash-proof and weather-sealed, which comes in very handy if you are working in weather conditions which are not the best. It gives very accurate readings and has a Lumisphere (a small white sphere located at the top of the meter), the purpose of which, when rotated out and extended, is to assist in detecting the proper lighting on 3D objects. When the Lumisphere is retracted, it assists in helping to detect the proper lighting on flat surfaces, such as paintings.
The Sekonic Flash Master L-358 is portable and easily fits in a purse or pocket. My husband and I have found it to be an invaluable tool in our photography. If you are a photographer, either professionally or as a hobby, I would recommend this light meter for your use.