RONGPRO Self Leveling Laser Level, 50ft/15m Cross Line Laser level Laser Line leveler Beam Tool for Construction Picture Hanging Wall Writing Painting, Magnetic Mount Base and Carrying Pouch - Amazon.com
Magnusson Distance Measure 0.05m -15m, +/- 2mm,units of m/in/ft,2xAAA's not inc. | eBay
Magnusson IM0301 Red Self-Levelling Cross-Line Laser Level - Screwfix