AquaChek 561683 Total Dissolved Solids (TDS) Pool or Spa Test Strip Sku: AQU-561683-CIN91 This is a brand new part comes with a full manufacturer warranty!!! This sale transaction is for only this part number: 561683. Total Dissolved Solids (TDS) are the measure of everything that has dissolved in the water over time from numerous chemical dosages. High TDS contributes to cloudy water, makes balancing chemicals more difficult and can lead to increased chlorine usage. Test the TDS to find out if it is time to drain and refill a hot tub. Get test results in seconds with just one dip! Dip an AquaChek TDS strip in your pool or spa water for one second and remove it immediately. For a clean and healthy pool, test the water at each end a minimum of twice a week! Features: Measure totally dissolved solids AquaChek TDS is the only test strip on the market that measures Total Dissolved Solids in pools and spas! One easy dip gives you accurate results in seconds. Checking TDS frequently helps you prevent hazy water, scale buildup and corrosion caused by high levels of TDS. TERMS OF SALE: If, after receiving this item you discover that it was not the one you wanted, simply return it for a full refund within 14 days. You will heave to pay for the return shipping charges. Refund is void if you have installed, used or damaged the item in any way. Item must be returned with its original box, packing materials and instructions. Payment via PayPal must be received within 3 days of transaction and prior to shipping. SHIPPING:Shipping charge will be based upon location. Please use the shipping calculator or request a shipping quote. International buyers: Customs fees, duties, taxes, tariffs other fees are your responsibility. Arrival time will depend on your location. If you have any questions, feel free to ask. Thank you for visiting!