The ones you buy in Turkey or Spain, my wee fellas got one and their great accurate up to about 2km with 4/5 designs LOL
I use this one mate as it gives out 3 lines for your 90 deg and up the middle for your 45 deg http://www.powertoolworld.co.uk/bos...er-3-lines-max-20-m-with-target-included.html
Still waiting on my free tools from a Bosch Exec from Germany when he hit the back of my parked van....
Thankfully not, even though the missus has told me to go and take a flying ***% to myself on many occasion!
I find lasers are worth there weight in gold if your fitting flooring around an island or lining up plank rows.