SX721 Portable pH/ORP Meter Kit

Cat. No.

For more information please call +1 (860) 436-9221
or email us at
For more information please call +1 (860) 436-9221
or email us at

Product Description:

Apera SX721 is designed for lab-grade measurement of pH and ORP, suitable for general water solutions’ applications such as water treatment, groundwater, surface water, hydroponics, environmental monitoring, beverage making, etc.

Basic Features

  • Intelligent functions –– auto. calibration, auto. temperature compensation, self-diagnosis, data logging, auto. power off, and more.

  • Digital filter technology –– enhance the meter’s response time and measurement accuracy

  • Automatic electrode recognition –– the meter automatically switches to the right parameter mode according to the connected electrode

  • Data logging –– 400 sets of data storage and recall

  • Built tough –– IP57 water-resistant structure, ideal for use in harsh environment

pH Features

  • Built with lithium glass membrane and fiber ceramic junction, the 201T-S pH/temp. electrode provides the foundation for quick response and accurate pH readings.

  • 1 to 3 points of quick auto. calibration, recognizing up to 13 kinds of pH buffers.

  • The self-diagnosis function helps you understand common problems and how to fix them.

  • With the 8-pin to BNC converter (sold separately), a variety of LabSen pH electrodes can be connected to meet the testing needs of specialized applications.

ORP Features

  • Equipped with 301Pt-S Platinum ORP electrode featured with stable potential and fast response

  • No need for ORP calibration

  • The platinum sensor is easy to clean and maintain

  • Comes with 222mv ORP standard solution for checking accuracy and sensor conditioning

Comes as a complete test kit in a rugged carrying case for convenient field test



Measurement range

(-2.00 to 19.99) pH


0.1/0.01 pH


±0.01pH±1 digit

Input current

≤2×10-12 A

Input impedance

≥1×1012 Ω

Temp. compensation range

(0 to 100) ˚C (automatic)


Measurement range (mV/ORP/EH)

-1999 mV to 1999mV





Other Technical Parameters

Data storage

200 sets

Data content

Serial number, measurement value, measurement unit, and temperature

Power Supply

Two AA alkaline batteries (1.5V x2)

Dimensions and weight

Meter: (65×120×31) mm/180g

Complete Kit: (255 x 210x 50) mm/1760g

Quality and safety certification

CE, ISO 9001:2015

Working Condition

Working temperature

5 to 35˚C

Working humidity


IP rating

IP57 water-resistant

Additional Resources and Information:


SX721 Portable pH/ORP Meter Kit


      295.00 295.00 295.0 USD


      Option not available

      Add to Cart
      Credit Cards

      SX721 Portable pH/ORP Meter Kit Accessories:

      201T-S 3-in-1 pH/temperature Electrode, ATC enabled, 8-pin Connector, for Apera 400(S) Series Portable Meters
      Cat. No.:

      70.00 70.0 USD

      View Details
      301Pt-S ORP Combination Electrode, 8pin Connector, Compatible with Apera 400/400S Series Meters
      Cat. No.:

      83.00 83.0 USD

      View Details
      8-pin to BNC/RCA Converter
      Cat. No.:

      15.00 15.0 USD

      View Details

      View our 2023
      Product Catalog

      Get our complete and
      latest product portfolio
      for free.

      Download Scilogex

      Find a collection of product manuals and brochure PDFs available for download.

      Earn Rewards

      Scilogex members earn points
      whenever they log in and use their
      account. Cash in your points to enjoy
      exclusive deals and discounts on our
      lab equipment and supplies.