The 3473 Dipole Electromagnet accepts a range of pole caps with face diameters up to 150mm. The model 3473-50 is fitted with a 50Amp coil pair, and has a coil gap of 127mm. The model 3473-70 is fitted with a 70Amp coil pair with enhanced cooling, and has a coil gap of 96mm. The 3473-70 is recommended when high fields are required at large pole gaps or to achieve maximum field stability for spectroscopic or similar applications.