Spare Parts (Equipment / Apparatus) › ELECTRICITY KIT - THOMPSON’S RING TO FIT IRON CORE Image 1 of 1 ELECTRICITY KIT - THOMPSON’S RING TO FIT IRON CORE $3.63 Code: PA1763-270 Add To Cart Added! Code: PA1763-270 IEC Electricity Kit spare part - Thompson's ring (floats in AC magnetic field). You Might Also Like Quick View ELECTRICITY KIT – COILS - 1000T FOR U/I CORE $78.80 Quick View ELECTRICITY KIT - MAGNETISM DEMO - RECTANGULAR COIL $62.00 Quick View ELECTRICITY KIT -MULTIMETER - AC & DC $43.50 Quick View MOUNTED MOTOR - SPARE FOR BKE (BEK) KITS $9.75 Quick View ELECTRICITY KIT - RESISTOR 100 OHMS - DUAL $37.50