EZO™ pH Circuit

Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)

$ 42.00

Connect any off-the-shelve pH probe to your microprocessor that supports UART or I2C. Full range pH reading from .001 – 14.000 with an accuracy down to the thousandths place (+/- 0.02). Made by Atlas Scientific.

44 in stock (can be backordered)

SKU: AS.EZO-PH Categories: ,



  • Full range pH reading from .001 to 14.000
  • Accurate pH readings down to the thousandths place (+/- 0.02)
  • Temperature dependent or temperature independent readings
  • Flexible calibration protocol supports single point, 2 point, or 3 point calibration
  • Calibration required only once per year with Atlas Scientific pH probe
  • Single reading or continuous reading modes
  • Data format is ASCII

Two data protocols

  • UART asynchronous serial connectivity (RX/TX voltage swing 0-VCC)
  • I2C (default I2C address 0x63)
  • Compatible with any microprocessor that supports UART, or I2C protocol
  • Operating voltage: 3.3V to 5V
  • Works with any off-the-shelf pH probe

Sleep mode power consumption

  • 0.995mA at 3.3V

Circuit Specs

  • Dimensions: 13.97mm X 20.16mm (0.55″ X0.79″)
  • Weight: 1.76 grams

Additional information

Weight 0.01 kg
Dimensions 5 x 2 x 2 cm

Atlas Scientific

Open Source


1 review for EZO™ pH Circuit

  1. Rated 5 out of 5

    patran (verified owner)

    Works as intended, I suggest getting an inline voltage isolator with this chip or the complete carrierboard, otherwise you’ll get a lot of interference from pumps or other electronic devices that are also in your reservoir.

    Used it with a raspberry pi 3

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