Spear & Jackson SL600 600mm (24\") Spirit Level The Spear & Jackson SL600 is a mid to high quality spirit level accurate to within 0.5mm per metre. It has a double milled base with V groove and an extra integrated viewing mirror. It is lightweight but strong thanks to its aluminium body. Features: 0.5mm/m accuracy Light but strong aluminium body and super clear vials Double milled base with V groove for easier balance on pipes Extra top edge viewing window allows the user to also read vertical vial from the front elevation Non-slip, soft feel hand grips for user comfort Specification: Length: 24\"