Hanna Instruments HI98172, Portable pH/ORP/ISE with Calibration CheckCondition:* Used, Possibly a Sales Demo Unit.* Unable to Test; Needs Rechargeable Batteries, 4 x AA, Not Included*As Pictured.Additional Notes:* Exchange Out the pH Sensor For an ORP Sensor To Obtain mV Readings.* ISE Sensors Are Calibrated up to Five Points and Measurements are Displayed in ppm.* Waterproof Casing.Hanna InstrumentsHI98172