This is by far the best timing light period. Twice as bright and twice as accurate as anything else on the market. I have used it for years outside and IMO there is nothing better.
There's a reason it cost 3X as much as the flaming river job which is very slow and dull, especially outside.

LINK

I have used all of these at one point in time and the blue one is not even in the same class as the rest. The blue one is the same as what MSD sells even though MSD does not make it. That tells you something.

My blue one was sold to me by French Grimes the magneto guy when he did my mags. It kicks butt and is more accurate and brighter with a more focused light than the rest like I said above. There is nothing better I am telling you.