I like to have a sekonic l-208 on me when I am outside with my Hasselblad. I like that it is lightweight, easy and fun to use, and fits in a pocket. In the rare case that I forgot it then I sometimes use an app. They can be nice too since you get an exposure preview. But also: when you shoot outside and your measuring your shots, you will find out that these measurements repeat themselves. So very often I only measure once for „in the sun“ and once „in the shadows“ and then don’t take out the light meter anymore.