PYNQ Test function: conductivity or total dissolved substances TDS or temperature Test accuracy: 2 percent Test range: conductivity 0-9990um or cm TDS: 0-9990ppm Temperature: Accurate 0.1-80Celsius, 32.0-176.0Fahrenheit Color:White Material: Plastic and Metal Size: 150 x 20mm Package Content: 1 x Water Quality Tester Only the above package, other products are not included. Note: Light shooting and different monitors may cause the color of the item in the picture a little different from the real thing. The allowable measurement error is 1-3 cm. IMPROVED AND DURABLE ACCURACY - With the alloy probe and the latest sensors, you can get nearly exact readings every time. Plus, the Digital TDS Water Tester can be easily recalibrated for increased accuracy whenever needed. SUITABLE FOR ANY TYPE OF TDS OR TEST - Check Total Dissolved Solids or Electrical Conductivity from your aquarium, swimming pool or any water source. You can determine the efficiency of your RO, DI, or distillation unit, check your hydroponics setup's nutrient levels, and more. QUICK, RELIABLE, AND EASY TO USE - Just soak in the TDS meter, stir and get your results in seconds. No calibration or setup needed, you can use it right out of the box. Follow the step-by-step instructions, then check the easy-to-read screen. SAVE MONEY AND STUFF - Instead of shelling out for an expensive lab test or professional equipment, you can get reliable results from home. ppm-meter can also be taken anywhere with you, ready to be tested on the go.