HOBO Data Logger MX2501 Bluetooth pH and Temperature Loggers Onset

Description

These have been tested and work as expected except I couldn't perform a pH calibration because the electrodes are older than 6 months and I don't have pH solutions. That said, the logger functions as expected! The pH electrodes will need to be replaced and can be purchased from Onset. The loggers appear to have been used in the summer of 2020, the electrodes were
NOT
stored in a solution. HOBOconnect is free and can be downloaded from the App stores.
"T
he electrodes should be replaced after six months of use.
NOTE:
pH electrodes should always be stored in storage solution when not deployed."
Product Description
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
HOBOconnect
app and your mobile device or Windows computer, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOconnect 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. (
NOTE
: pH electrodes should always be stored in storage solution when not deployed.)
Highlighted Features
Guided pH calibration following on-screen prompts in HOBOconnect app
Rugged PVC housing for deployment in both freshwater and saltwater environments
Quick and easy data offload via Bluetooth Low Energy (BLE) to mobile devices or Windows computers
Water detection system for longer battery life and less maintenance
Potentiometric pH electrode with plastic body, gel electrolyte, and double cloth junction
User-replaceable battery, pH electrode, and anti-biofouling copper guard
Accuracy of ±0.10 pH units within ±10°C of temperature at calibration