Ultrasound pressure mapping can be performed with an electromagnetic hydrophone based on the Lorentz force. The hydrophone is made of a metallic wire vibrating while submitted to an ultrasound wave, and a constant magnetic field is applied. The Lorentz force induces an electrical current proportional to the integral of pressure along the wire. 2D pressure field mapping is achieved by performing a tomography through wire translations and rotations in the imaging plane. Characteristics of such type of hydrophone are assessed in this study. Signal is linear over pressure from 10 kPa to at least 10 MPa with a determination coefficient R2 above 0.997. Excellent resistance to cavitation has been observed. Frequency bandwidth was measured against three different wire diameters: 70 um, 100 um and 210 um, and results showed that upper cut-off frequency decreases with increasing wire diameter. Additional measurements showed that wire tension has no visible effect on the signal. These results indicate that electromagnetic hydrophone should be convenient for High-Intensity Focused Ultrasound and possibly shockwave transducers calibration.