Toroid current sample transformer recommended for each circuit monitored by the 1750-TLM Tower Light Monitor.Potomac 12525 Toroid Sample Transformer for 1750-TLMSKU: 12525$0.00PriceExcluding Sales Tax | Shipping PolicyQuantity*Add to CartBrandPotomac InstrumentsProduct DetailsManufacturer: Potomac InstrumentsManufacturer part number: 12525Sold by: Radio Gearheads, 705 Eaton Ave N, Fosston, MN 56542 Questions about compatibility, configuration or lead time? Call 1-800-992-1506 or use Get A Quote.