For on site of water testing with great accuracy, we have various types of hand held water tester.Types of Hand held Meter. · pH Meter · TDS Meter · Conductivity Meter · O.R.P. (Oxidation Reduction Potential )Meter · D.O.Meter (Dissolve Oxygen) Features:• Microprocessor based fast, reliable and accurate measurements.• Replaceable Electrode Module• Large LCD display for reading convenience• Easy Single Point Calibration• Available in a portable pouch.