I was just wondering if any body had any good techniques or reference books on setting up the slope for patios/walkways? I have searched on the lasers website site but have not found any good info to keep with the laser at all times. I have single slope down but dual slope seems to be confusing me mainly bc of were i should have the laser positioned or if it matters? I would love to here your setup styles/preferences. Correct me if I'm wrong I have not seen to much info on the forum about the subject beside if to buy a dual slope laser was worth the money. Also i have about a $1200 spectra laser that self levels and has the dual slope function. I figured the manual that came with the laser would shed some light but basically it only tells u how to turn it on!