adjustable timing lights

My experiences are you get what you pay for. i had an atozone, sears, and some other brand, one of them had the total advance on it, they all were not accurate, my dad let me try his Snap On and it showed a difference between all of them, So i finally gave in and paid for a Snap on, problem is i should have bought the one with totla advance but my balancer is marked so it still works, if you have a high compression motor then get a good timing light, if its not so important to you then get a X-brand timing light. A Mac tool or a high end brand is the proper way to go.