As an industrial electrician I've used this gauge for multiple installations and it never disappoints. Through trial and error, I found that it's durable, accurate, and versatile .The 500-foot length is perfect for projects both big and small. Its Industrial and Scientific listing assures me of its quality and reliability. The only con I can mention is that the price is a bit high, but it certainly reflects the quality of the product. Overall, i highly recommend this gauge for professionals in tSee full review