I use a g-shock watch with a time memo function. It also has auto illumination if I want to see the time I just have to tilt my wrist.
The best feature is the time memo, when I get toned I press the button and it makes a time and date stamp, on scene, press it again, do a procedure, press it again, anytime you want to make a time notation, you press the button, when you get done, you can review them and add them to your report. Very slick feature, very handy and quick, you don't need to stop what your doing to write it down.