This meter has been engineered with a host of features suited for the aggressive environments commonly found in agricultural applications. Housings and cable connections have been sealed against vapor and humidity. This TDS meter comes with a probe specifically made for horticulture and hydroponics applications. The probe compensates for temperature variations automatically, is easy to clean, is very stable and needs little maintenance. The 12 VDC power supply included with the meter eliminates low battery failures. It is supplied with Conductivity and TDS probe, 12 VDC adapter, 1500 ppm calibration solution (20 mL), calibration screwdriver. 0 to 1990 milligrams per liter range. 10 ppm resolution. +/-2 percent FS accuracy. Manual at 1 point, through trimmer calibration. Automatic, 5 to 50 degree C with beta is equals to 2 percent/ degree C temperature compensation. 0.7 TDS conversion factor. Conductivity and TDS (included) probe. 12 Vdc power adapter power supply. 0 to 50 degree C, RH maximum 100 percent environment.Product FeaturesWater resistantLow maintenance probeHang right above the samplesProbes designed for horticulture and hydroponics applicationsMeasures 3-25/64 length by 4-19/64 width by 1-11/16 height