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 PLOTTING COMPASSES SET OF 10 IN VIAL $37.50 Quick View MOUNTED BUZZER - SPARE FOR BKE (BEK) KITS $9.75 Quick View ELECTRICITY KIT - 1-WAY SWITCH $32.60 Quick View CHANGEOVER SWITCH – SPARE FOR BKE (BEK) KIT $7.00 Quick View ELECTRICITY KIT MAGNETISM DEMO SPIRAL COIL $70.50