A pair of Helmholtz Coils for generating a uniform magnetic field perpendicular to the axis of the Teltron D series tubes. The Teltron Tube Holder D (B8A49463) allows the coils to be configured in the Helmholtz geometry or to produce magnetic fields aligned vertically or coaxial with respect to the tube axis. The maximum field strength generated by the coils (~ 10 mT) is approximately 300 times weaker than that produced by an MRI machine (~ 3T) which are known to be safe for use by people with medical implants such as pacemakers.Technical Specifications:Number of turns: 320Max. continuous current: 1.0 AMax. momentary current: 10 min @ 1.5 A; 3 min @ 2 AEffective impedance: 6OMax. field strength: approx. 10 mTConnectors: 4mm socketsRequires a 20V Power Supply (B8G85483) and 4mm Leads (B8R06545)