Tds (Total Dissolved Solids) Meter Sensor Compatible With Raspberry, Etc. Product Details TDS (Total Dissolved Solids) indicates that how many milligrams of soluble solids dissolved in one liter of water. In general, the higher the TDS value, the more soluble solids dissolved in water, and the less clean the water is. Attention : This kit does not include CQRobot ADS1115 16-bit AD conversion module. For technical support, please refer to CQRobot Wiki to get the test code, SKU: CQRSENTDS01. SPECIFICATION Signal Transmitter Board Specifications TDS Probe Specifications Cable Specifications SHIPPING LIST 1 * Signal Transmitter Board Wide Voltage Input: 3.3V to 5.5V. Good Compatibility Output: 0 to 2.3V analog signal output, compatible with 5V or 3.3V controller. AC Excitation Source: effectively prevent probe from polarization, Waterproof Probe. Easy to Use: Arduino compatible, simple connection, plug and play without soldering. Used with ADS1115 16-Bit ADC Module (ASIN: B08KFZ3PVT, Model: CQRADS1115), Compatible with Raspberry Pi Motherboard. Note: When using the TDS instrument sensor, the sensor probe is immersed in liquid, and the purchaser needs to Separate the sensor Probe Protective Cover to avoid incorrect data reading and malfunction. 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.