Place every tile right. The Bosch UniversalLevel 3 uses vertical and cross line lasers so you can easily see how to align them. You don't need to worry about manually adjusting it either as it has a +/-3° self-leveling range. It'll give straight lines despite any bumps or dips. And with an accuracy of 0.5 mm/m, they'll be no funhouse vibes because everything will be nice and straight. Good to know - Putting up curtain rails? Its 120° opening angle helps get them straight in the wall, even when you're close up - Just pop it on the height adjustable tripod to get it to the height you need - A handy storage bag comes in the box so you can store it away safe and sound