The maximum field strength generated by the coils (~ 10 mT) is approximately 300 times weaker than that produced by an MRI machine (~ 3T), known to be safe for use by people with medical implants such as pacemakers. Instructions included.
EHT Power Supply
Helmholtz Coils S Pair of Helmholtz coils for generating a uniform magnetic field perpendicular to the axis of the S series tube.
Tube Holder S allows the coils to be configured in the Helmholtz geometry or at variable distances to produce magnetic fields aligned vertically, or coaxial, with respect to the tube axis.
Digital Meter with two shunts included

Coil diameter: 138mm
Load rating: 1.0 A (Continuous operation); 1.5 A (Short-term operation)
Number of turns: 320
Max. field strength: approx. 9 mT.
Effective Impedance: approx. 6.5ohm
Terminals: 4mm safety sockets

Physics School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Helmholtz Pair of Coils Atomic and Nuclear Physics Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities