HM Digital TDS-4TM Meter with Digital Thermometer</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>The Digital TDS-4TM Water Meter is ideal for testing applications such as hydroponics and gardening， pools and spas， aquariums and reef tanks， water ionizers， drinking water and more</li><li>The smallest and lightest TDS meter available on the market.</li><li>Hold Function - Saves measurements for convenient reading and recording.Auto-off function - Turns off meter after 10 minutes of non-use to conserve batteries.</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41GrngIJGcL.jpg' noproxy></br>