Hi 9813-6 is a versatile, water resistant multipara meter portable meter specifically designed for Agricultural applications such as hydroponics, greenhouses, farming & nurseries. it features an extra large LCD that clearly displays the parameter being measured as well as calibration instructions. Calibration is fast & easy with knobs located on the front panel of the instrument. Hi 9813-6n is designed for simplicity of use in taking pH, ms/CM, ppm & temperature in the degreec scale measurements. Hi 9813-6 includes all the features of the hi 9813-5 while incorporating our exclusive Cal Check feature. Cal Check allows the user to easily Check the probe calibration Status at any time. Comes with the hi 1285 series pH/EC/tds/temperature probe. This probe features a Fiber junction & gel electrolyte making it ideal for fertilizer solutions.