Laboratory electromagnets are simple U shaped electromagnets. The air gap is continuously variable with two way knobbed wheel sctew adjusting system and the poles are then locked in any position. Two continuous wound coils are mounted on two poles which are fitted to two yoke and supported on coil shoes. Magnetic field strength up to 14,000 Gauss in an air gap of 10mm is available with these electromagnets. Available in pole diameter from 30mm to 100mm.