Hiletgo Tds Sensor Water Conductivity Sensor Liquid Detection Sensor Water Product Details Specifications: Description: Attention: Package included: Wide Voltage Input: 3.3~5.5V; Output Voltage: 0 ~ 2.3V Analog signal output, compatible with most of 5V or 3.3V Arduino controllers AC Excitation Source, effectively prevent probe from polarization Plug and play, easy to use, you can build a TDS detector easily to measure the TDS value of liquid. It can be used in water quality application, such as domestic water, hydroponics. So you can easily DIY a TDS detector to reflect the cleanliness of water to protect your health. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.