P-521 Portable pH/DO Meter


The P-521 is a reliable pH and dissolved oxygen meter, designed for environmental, industrial, and laboratory applications. Its user-friendly interface, durable construction, and high-accuracy sensors make it perfect for water quality analysis on the go.

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Main Features

  • Large LCD screen with controllable white backlight.
  • Humanized designs like rack and skid proof shell make it more convenient for users.
  • Built-in microprocessor chip with functions of auto calibration, auto temperature compensation, data storage, function setup, self-diagnosis, auto power off, low voltage display.
  • Double-parameter and equipped with pH electrode and DO electrode, can recognize electrode automatically.
  • Auto recognition of standard pH buffers and there are three series of standard buffers for option: USA, NIST and China.
  • Able to set pH measurement modes of high purity water and pure water with ammonia.
  • DO mode has functions of ATC, auto salinity compensation and auto pressure compensation.
  • New structure polarographic DO electrode can measure temperature, salinity and dissolved oxygen simultaneously and equipped with special DO electrode calibration sleeve, only need 3~5 minutes for polarization.
  • IP57 and there isoptionalcarrying case.
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