First is a cross line laser, these cross line laser project a horizontal and vertical line at the same time, this can be very useful if you are working to right angles fixing tiles or kitchen cabinet etc. The biggest problem a tiler can run into is their tiles starting to run off, this can result in a different height when the tiles eventually come back to meet the wall you start from.
A rotary laser level can be really useful when undertaking any tiling projects and can be more accurate than an ordinary level.
Rotary lasers can produce a 360 degree red laser line around the room making them ideal when tiling walls around a bathroom.
Straight Line Lasers
Straight flooring lasers can also be very useful when tiling as this can shoot a straight line down the room and can project where the tiles are going to end up, unlike a chalk line that can disappear once the adhesive has been troweled on, the laser line will still show on top of the adhesive so you will never loose your tile line to follow.
Layout line lasers are used by many floor tillers as they have two lasers set out at 90 degree angles, this can be useful when tiling on a 45 degree angle such as herringbone and diamond bond patterns.