DIY: How to choose and use a line laser  

Line lasers are a great bit of kit for everything from putting up  pictures to hanging curtain rails and checking a new countertop is flat

The Stanley Cubix, from €110.

If you’ve ever held a traditional spirit level under one aching elbow while sliding a hearty length of shelving up the wall, you’ll know exactly how limited they are when working alone. 

Enter the self-levelling line laser. Line lasers are wonderful bit of kit for everything from putting up multiple pictures, installing wallpaper to hanging curtain rails and checking a new countertop is nicely flat.