Johnny Metric Easy Read Aluminum Rafter Square 40 6715 And the Pulse receiver mode Model:G3 32X Auto Level And the Pulse receiver mode can be operated with an optional laser receiver (LR 6 or LR8) for applications with a 165ft working range It is equipped with a dual clamp locking mechanism to allow elevation ranging from 46 inches up to 72 inches The EZ Read laser etched graduations have numbers that are highly visible and has a thick edge that is useful as a saw guide The 18cm Metric Johnny Square Professional Easy Read Aluminum Rafter Square comes with a low glare protective anodized finish and the centimeter scale reads from 3cm to 10 cm