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Pen-Type Tester

The pen-type water quality testers offer an ultra-compact, lightweight, and energy-efficient solution for on-site, immediate measurements of key water parameters such as DO, pH/ORP, EC/TDS, Free CL, and optionally, Ozone. These testers are designed for ease and speed of measurement, boasting IP65 protection to withstand challenging field conditions:


  1. The DO Tester (NPT-DO601) provides a measuring range of 0 to 20mg/L and 0 to 60°C, with a resolution of 0.1mg/L, 0.1°C, and an accuracy of ±1% of the full scale. Its standby time exceeds a year, ensuring consistent, long-term usage.
  2. The pH/ORP Tester (NPT-PH101/6) has a measuring range of 0 to 14pH and -999 to +999mV, offering a resolution of 0.01pH, 1mV, 0.1°C, and an accuracy of ±0.02pH and ±1mV. This tester includes a feature to switch between pH and ORP mode, providing versatile usage options.
  3. The EC/TDS Tester (NPT-CD501/6) has a measuring range for EC from 0 to 20mS/cm, and for TDS from 0 to 1000ppm. It offers a 2% full-scale accuracy and resolution, ensuring precise measurements.
  4. The Free CL Tester (NPT-CLOZ801) measures from 0 to 20mg/L with a resolution of 0.1mg/L and accuracy of ±2% of the full scale.
  5. Lastly, the Ozone Tester (also NPT-CLOZ801) measures from 0 to 20mg/L, with the same resolution and accuracy as the Free CL Tester.


Application Features:


  • Pen-type design for maximum portability and ease of use.
  • Immediate, on-site monitoring of crucial water parameters.
  • IP65 protection for reliable operation in challenging environments.
  • Extended standby time of over a year for long-term field use.
  • pH/ORP Tester offers switchable modes for versatile measurements.
  • High accuracy and resolution for precise readings.
  • EC/TDS, Free CL, and optional Ozone testers ensure comprehensive water quality assessment.
About Us

Karma Instrumentation & Control is a specialist supplier of process control and automation equipment and SI systems, as well as a manufacturer and designer of process and electrical control panels.

Contact Us

• Address: Block A, Unit 3D, Wild Fig Business Park, 1494 Cranberry Street, Honeydew, 2170

• Email:

• Call us: 011 794 2859

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