  The Electron-Muon Ranger (EMR) is a fully-active tracking-calorimeter
installed in the beam line of the Muon Ionization Cooling Experiment (MICE).
The experiment will demonstrate ionization cooling, an essential technology
needed for the realization of a Neutrino Factory and/or a Muon Collider. The
EMR is designed to measure the properties of low energy beams composed of
muons, electrons and pions, and perform the identification
particle-by-particle. The detector consists of 48 orthogonal layers of 59
triangular scintillator bars. The readout is implemented using FPGA custom made
electronics and commercially available modules. This article describes the
construction of the detector from its design up to its commissioning with
cosmic data.
