Power supply for GMW 3470 standard power supply (0-5 A, 0-60 V) and polarity switch. For use with Pos. 4: RH2030 Hall measurement electronic. The power supply and the polarity switch is completely controlled by the software. 90° stand for Electro Magnet GMW 3470 incl. Standard sample holder and sample carrier as well as a special sample carrier with round probes for contacting 10x10mm, 12x12mm, 14x14mm samples. (necessary for cryostat use and horizontal sample contacting) RH 2030 Hall Measurement Electronic for determination of the specific resistivity and Hall coefficient of semiconductor samples with van der Pauw structures. - 1QTY; INV: 23R017