A portable digital readout measuring device preferably includes a digital readout device, a guide and at least one mounting base. The guide is slidably retained in the digital readout device. The digital readout device preferably includes a LCD display and a readout magnet. The readout magnet is attached to a backside of the digital readout device. Preferably, a connection cable connects the digital readout device to a slave LCD display. The mounting base preferably includes a retention slot, at least one fastener and a base magnet. The guide is inserted into the slot and retained in the mounting base by tightening the at least one fastener. An alternative mounting base includes a round magnet. In use, the readout magnet is attached to a way of an industrial machine. The guide is slid, until the base magnet contacts a carriage of the machine.