Skip to search Skip to main content Skip to navigation

Call us at 1-888-826-6342

We noticed you are from . Visit your local site for regional offers and live support.

HOBO MX Bluetooth Low Energy PH and Temperature Data Logger


Item# MX2501

In stock

Lead Time (If not in stock): 9 weeks
HOBO MX Bluetooth Low Energy pH and Temperature Data Logger MX2501 MX2501
  • Bluetooth Low Energy 100-foot communications
  • Stores: 43,000 measurements
  • Accuracy of ±0.10 pH units within ±10°C of temperature at calibration
  • Multiple Start & Stop options

MX2501 Model Options

View all models

Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Measurement Type
Number of Measurements
Input Type
Maximum Samples
Data Interface
Max Sampling Rate
Additional Feature

The HOBO MX2501 pH and Temperature data logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers, and oceans. Leveraging Bluetooth Low Energy (BLE) technology, the MX2501 pH logger communicates wirelessly with the free HOBOmobile app on iOS and Android devices, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOmobile app makes an otherwise complicated process easier to follow. This affordable and compact logger dramatically cuts the time and effort needed to collect field data, while also offering higher-resolution data.

You can download the HOBOmobile app for free for Android devices here and for iOS devices here.

The Hobo MX Gateway (purchased separately) can be used to aggregate the data from up to 100 Hobo MX data loggers directly to a PC via Ethernet or WiFi communications.
loading all models
loading all reviews
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 9ms
  • bvseo-msg: The resource to the URL or file is currently unavailable.;
loading all QA

Is it possible to read the logger in real time instead of reading out the data? I would like to be able to cross-calibrate it to a CRM across multiple temperatures. And does it read in mV in addition to pH units? Thanks!

Asked by: MattB
Thank you for your question. The only way to read near real-time is using MX Gateway to Onset's cloud storage.
Answered by: Raptor
Date published: 2021-03-03

Can this be used for industrial purposes, especially with chemical exposure in medical device industry?

Asked by: Sonny
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2022-03-18
  • y_2024, m_7, d_11, h_5CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
  • loc_en_US, sid_MX2501, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 34ms
Replacement pH Electrode for the HOBO MX2501 logger. Electrodes should be replaced after 6 months.
1 In Stock
Anti-Biofouling guard for the HOBO MX2501 logger
9 In Stock
Replacement End Cap for the HOBO MX2501 logger
0 In Stock
Storage Cap for protecting the pH electrode of the HOBO MX2501 logger
0 In Stock
4 oz. calibration beaker for the HOBO MX2501 logger
10 In Stock
Cal Solution pH 4.01 (475 mL bottle)
0 In Stock
Cal Solution pH 7.00 (475 mL bottle)
0 In Stock
Cal Solution pH 10.00 (475 mL bottle)
0 In Stock
pH Electrode Storage Solution for the HOBO MX2501 logger
0 In Stock
Calibration Kit for the HOBO MX2501 logger. Consists of pH 4.01, pH 7.00, and pH 10.00 buffer solutions (475 mL bottles).
0 In Stock
Calibration Kit and Storage Solution combination
10 In Stock
HOBO MX BLE Gateway - Aggregator
0 In Stock
Save Configuration