Sekonic Flashmeter L-358

This meter provides a wide range of functions that correspond with most
manufacturers camera settings in all formats, which will satisfy professionals as
well as serious enthusiasts.
Its sealed housing and controls make it water and moisture resistant.
Yes, you can use it in the rain, but it is not an underwater meter.
Its large LCD display makes readings easy and lights up automatically in dark
surroundings.
In order not to crowd the controls, four functions which are less frequently used,
are confined to DIP switches, located in the battery compartment.
Because of its many features, the L-358 requires this rather extensive manual.
But since you will never use them all at the same time, once you have learned all
about it, it is simple and its use will become second nature.