The handheld and compact carrying case makes it easy to put in your pocket or bag and take it with you. Quick and Accurate Readings, - Just turn it on, immerse in about 1 inch of water and read the display, the large digital display makes it easy to read. Automatic calibration, no need for any adjustment screwdriver, it only takes 1-3 seconds to complete the automatic calibration calibration, measure the total dissolved solids (tds) in the water, know exactly when to replace the water filter. Perfect for home and laboratory TDS testing applications including drinking water, swimming pools, aquariums, hydroponics and more. No need any adjustment screwdrivers, just finish the calibration with Auto calibration with 1-3 seconds, Measure total dissolved solids in water(tds), Know exactly when to change water filters., Weight: 0.08157103694 pounds, Manufacturer: puhae