Features: _x000D_ _x000D_ _x000D_ _x000D_ 1. Hold function: Saves measurements for convenient readign and recording _x000D_ _x000D_ _x000D_ _x000D_ 2. Auto-off function: Turns off meter after 10 minutes of non-use to conserve batteries. _x000D_ _x000D_ _x000D_ _x000D_ 3. Measurement Range: 0-9999 ppm (When the measured value exceeds 999 ppm, please make the display value x10) _x000D_ _x000D_ _x000D_ _x000D_ Application: _x000D_ _x000D_ _x000D_ _x000D_ 1. Check the performance of your water filter. _x000D_ _x000D_ _x000D_ _x000D_ 2. Check for nardness (1 grain = 17ppm). _x000D_ _x000D_ _x000D_ _x000D_ 3. Make sure you always drink pure water _x000D_ _x000D_ _x000D_ _x000D_ Please refer below standard for testing water _x000D_ _x000D_ _x000D_ _x000D_ 0-50 ppm --------- High Purity Water _x000D_ _x000D_ _x000D_ _x000D_ 50-100 ppm ------- Pure Water _x000D_ _x000D_ _x000D_ _x000D_ 100-300 ppm ------ General Pure Water _x000D_ _x000D_ _x000D_ _x000D_ 300-600 ppm ------ Fouling _x000D_ _x000D_ _x000D_ _x000D_ 600-1000 ppm ----- Poor Taste Water,Fouling _x000D_ _x000D_ _x000D_ _x000D_ Above 1000 ppm --- The water is not suitable for drinking _x000D_ _x000D_ _x000D_ Description: _x000D_ _x000D_ _x000D_ _x000D_ Condition: 100 % new and high quality _x000D_ _x000D_ _x000D_ _x000D_ Item Type: TDS Water Meter _x000D_ _x000D_ _x000D_ _x000D_ Material: Plastic _x000D_ _x000D_ _x000D_ _x000D_ Measurement Range: 0-9999 ppm _x000D_ _x000D_ _x000D_ _x000D_ Accuracy: +/-2% _x000D_ _x000D_ _x000D_ _x000D_ Temperature Range: 0-50 celsius _x000D_ _x000D_ _x000D_ _x000D_ Size: 14x3cm/5.51x1.18" _x000D_ _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ _x000D_ _x000D_ _x000D_ 1PC Water Purity Tester Tool _x000D_ _x000D_ _x000D_ _x000D_ Notes: _x000D_ _x000D_ _x000D_ _x000D_ 1 Please allow 1-3mm measuring deviation due to manual measurement. _x000D_ _x000D_ _x000D_ _x000D_ 2 Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you