I purchased the SL-24 after seeing it demonstrated at a convention.When I recieved the SL-24 I was very unhappy to say the least.At the show the guy sat it on the floor and you could see the line for 50feet at least.Mine would only show up on the floor for about 7 feet. I returned it for a new one and got the same thing back.The only way to see the line for over 7 feet is to put it on the box it came in.I would NOT recommend buying this product to anyone. Unless you want to waste your money.