Check the listing for details. ESI, SR1 Standard resistor 50 ohm, 50 ppm. Condition: Seller refurbished. Listed at 345.00 USD. ESI, SR1 Standard resistor 50 ohm, 50 ppm Low emf, gold plated connectionsAir resistor 1 Watt, TCR 5 ppm/deg C, Power coefficient (PCR) 0.1 ppm/mWLong term stability 50 ppm.Certified Value 20 ppm. Bid with confidence! International Buyers – Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. Will ship worldwide at cost, with tracking# and insurance.Shipping cost on listing is a general estimate. You will be asked to pay actual shipping cost.We use Postal Service. If tracking and full insurance is not available for your country then we use FEDEX, DHL or UPS.