Features: Large LCD display, data hold, temperature unit switchable: / .OOTDTY Professional measurement for p-H/TDS/EC/SALT/TEMP/S.G/ORP/H2/Fertile/Resistivity.Suitable for household drinking water, hydroponics, lab, aquarium. With high sensitive glass probe, you can get a full measurement range of 0-14p-H.Probe is removable and replaceable, which extend service life of the water tester. Specification: Material: PlasticSize: approx 178x26mm/7x1inType: standard/with backlight/single probe(optional)P-H: 0-14TDS: 0-200000ppmEC: 0-200000/cmSalinity: 0-20%ORP negative potential: 1999MVH2 is rich in hydrogen: 0-2400 PPBS. G sea water specific gravity: 1.000-1.222Temperature: 0-60Nutrient solution fertility: 0-3 resistivity: 50 -20Package Includes: 1x Water Quality Testernote: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.