123CityFarmer Hydroponic Nutrient TDS Meter， Water Quality Tester for Hydroponic Nutrient Level， Household Drinking Water， Pool， Aquarium Water.<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>• Small size， convenient carrying</li><li>• Test liquid TDS/EC value such as hydroponic system nutrient quality， pool， drinking water， pool water or other agriculture purpose.</li><li>• Test liquid temperature such as hydroponic system nutrient quality， pool， drinking water or other agriculture purpose.</li><li>• Hold button to hold the reading for non-sight measuring condition.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41RG5tw7dlL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41PKJ3lKnhL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41mWufkZolL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41lREvGjSEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31mf2gHWQsL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51wiBOLm%2BqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41xqsGUHGYL.jpg" noproxy>