The Workpro W066005 is an electronic calliper with an analog readout range of 0 - 150mm. It is designed to be used for measuring the range of thickness of materials, from paper to thicknesses up to 150mm. It has two jaws, one fixed and one moveable, that are connected to the analog readout. The jaws are operated by a wheel located at the handle, and the readings can be taken from the easy-to-read analog scale. This calliper is also fitted with a locking tab that allows for quick and easy locking of the calliper in place when measuring.