Toll Free: 1-877-275-9606
(603) 746-5524
$5.99 Flat Fee Economy Shipping on Most Items Shipped in the Continental USA

You have no items in your shopping cart.

Subtotal: $0.00

COVID-19 Update: MicroDAQ.com, Ltd. is open for business and assisting our customers to the best of our abilities during these unprecedented challenging times. Please read our updated COVID-19 Statement here.

Onset HOBO MX2501 Bluetooth pH and Temperature Data Logger

Bluetooth pH and Temperature Data Logger

Part Number: MX2501

Ask a question (1)

Be the first to review this product

  • Long-Term pH and Temperature Measurements in Estuaries, Lakes, Streams, Rivers and Oceans (Salt and Freshwater Environments)

  • Wireless Transmission of Recorded Readings to Phone or Tablet Using Bluetooth Smart LE Communications

  • 2.0 to 12.0 pH and 2C to 50C Measurement Ranges and +/-0.10pH and +/-0.2C Accuracy

  • User-Replaceable Lithium Battery with 1 Year Typical Life (1 Minute Sampling Rate and Bluetooth Always On)

  • Stores up to 43,300 Measured Readings with Date/Time Stamp if Bluetooth Communications Not Available

Includes pH Electrode and Lithium Battery. HOBOmobile App Available on the Apple Store (iOS) and Google Play (Android)

  • Answer:

    Yes, this like most pH loggers and sensors typically need to have their pH electrode replaced somewhat regularly to ensure accurate readings.  With normal use Onset recommends replacing it every six months.   The electrode is available for purchase as a replacement item separately and shown on the right side of the webpage under "Related Products".   The part number is MX2500-ELECTRODE and it costs $115.  Here is a link to the page for it -



    It is also recommended that you calibrate the sensor before each use using a pH solution.  These are also listed on the page as accessory items however you are free to use any other pH solution you might already have.

Leave a Reply

Ask Your Question

* Required Fields