Check the listing for details. Apera Instruments F501-S All-in-one Fluoride Ion Electrode, Replacement Elect.... Condition: New. Listed at 287.08 USD. Brand New Apera Instruments F501-S All-in-one Fluoride Ion Electrode, Replacement Electrode for WS100 and WS200 Meter Manufacturer model: AI4729 All-in-one Fluoride Ion Electrode for Apera WS100/WS200 Fluoride MeterNo need for stirring or added reagents, directly measuring the ion concentration of fluoride in a quick and simple mannerStable potential, fast response rate, convenient useAutomatic Temperature Compensation Description Apera Instruments F501-S Fluoride Ion Electrode is the replacement electrode for Apera Instruments WS100/WS200 Fluoride Meter. It's featured with a 3-in-1 combination structure, which provides a convenient user experience and reliable measuring performance. Connector: 8-pin; Cable length: 3 ft. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system. Shipping and Handling Please allow 5-7 business days for the package to arrive, regardless of buyer location within the US. We will provide an online tracking number to you once the item has been shipped. It may take a few business days for our automated system to process the tracking number onto eBay. However, this will not affect the shipping times. Return Policy All our products are brand new and sealed. All items qualify for returns within 30 days of receipt. Feedback We take our reputation seriously. If you have any questions or concerns, please contact us and we will respond back to your message within 24 hours.