JCO2889Analog Quick Reference Calipers Quickly referencing dimensions and sizes are a commonpractice in the RC pit area.The quick reference analog calipers are capable of being locked into place to secure or save dimensions for later. The all-aluminum built and anodized tool is a very technical and precise piece.The quick reference tool has the ability to measure inside surfaces and outside surfaces depending on which end is chosen for use. A graduated scale is laser etched onto the tool to allow the user to measure in .5mm increments. A thumbscrew allows the sliding plane to be locked into place for quick comparisons. A display window is machined into the upper slide where dimensions are shown up to an overall length of 80mm. A small overall size makes it ideal to place in to RC sized tool and lock boxes used routinely out in the field. Features: JConcepts design and function Highly detailed design, 4-piece construction Graduated scale measuring in .5mm increments to 80mm Lockable sliding plane to save reference dimensions