Useful tool for a stage electrician, and for any tech doing power distribution in a new venue, or touring. It works good, the green and red light are clearly distinguishable even though symbols that are close by can sometimes appear brighter.. it's evident which one is on. Also, light is not really powerful: outdoor in the sunlight, i have to cover it with my hand to proper check.. i don't bother, but i feel that it could have been designed better for such price, or it should just be cheaper.