Steel tape (tape measure, push – pull steel tape, flexible ruler, retractable steel tape measure, flex tapes) The slide extends from the first strip of the ruler The slide can also be used as a depth gauge. The extension rule is a folding ruler which includes a brass slide for making internal measurements. The folding rulers cannot be relied on for extremely accurate measurements because a certain amount of play develops at the joints after continued use. The rule is usually made from strips, hinged in pairs to fold back on one another. Folding ruler is made from hardwood and reinforces at the ends with brass. It is the rule most often used by carpenters. It also overcomes the problem of carrying a long measuring rod to the workplace. The folding ruler can be used in a confined space where a long ruler would be inconvenient. Steel rulers may be flexible or non flexible, but the thinner the ruler, the easier it is to measure accurately because the division marks are closer to the work.įolding ruler (Zig – zag ruler, jointed ruler, surveyor’s rod) Steel rulers should be oiled to prevent rusting when not in use. The steel ruler is much more versatile and durable than wooden ruler.
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