Check the listing for details. Onset HOBO MX2501 Bluetooth pH and Temperature Data Logger. Condition: New. Listed at 825.00 USD. Onset HOBO MX2501 Bluetooth pH and Temperature Data Logger 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. HOBOconnect App Available on the Apple Store (iOS) and Google Play (Android)Onset HOBO® MX2501 Outdoor Bluetooth pH and Temperature Data Logger Specifications Data Channels 1 Humdity Channel 1 Temperature Channel pH Measurement Range: 2.0 to 12.0 pH (-512 to 512mV) Accuracy: ±0.10 pH (±20 mV) units within ±10°C of Temperature at Calibration Response Time: 1 Minute Typical to 90% at Constant Temperature in Stirred Water Resolution: 0.01 pH (0.02 mV) Temperature Measurement Range: -2°C to 50°C (28.4°F to 122°F) Accuracy: ±0.2°C (±0.36°F) Response Time: 7 Minutes Typical to 90% in Stirred Water Resolution: 0.024°C at 25°C (0.04°F at 77°F) pH Electorde Life 6 Months Bouyancy Fresh Water:13.6g (0.48 oz) Negative Salt Water:19.6g (0.69 oz) Negative Waterproof Up to 40 Meters Water Detection Water Conductivity Level to 10 S/cm or Greater is Necessary for Reliable Detection of Water. Deionized Water or Water Below 100 S/cm May Not Be Detected. The Water Conductivity Circuit May Not Reliably Detect Water that Has Frozen Around the Electrodes. Data Storage Capacity 43,300 Readings (When Bluetooth Communications Not Available) Logging Mode Fixed Interval (Normal, Statistics) or Burst Memory Mode Wrap when Full or Stop When Full Start Modes Immediately, Push Button, Date & Time or Next Interval Stop Modes Wrap When Data Storage Full, Push Button, Date & Time or After Set Interval Sampling Rate 1 Second to 18 Hours (User-Specified) Power Source AA 1.5 Volt Lithium Battery (User-Replaceable) Battery Life Bluetooth Always On: 1 Year typical @ 1 Minute Sampling Rate Bluetooth Off, Water Detect Enabled: 2 Years typical @ 1 Minute Sampling Rate Bluetooth Always Off: 3 Years typical @ 1 Minute Sampling Rate Note: Dependant Upon Environment, Operating Range, Logging Interval, Remaining Connected with the App, Excessive Downloads and Paging May Impact Battery Life Time Accuracy ±1 Minute per Month 0°C to 50°C Communications Type: Bluetooth Wireless Wireless Data Standard: Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0) Transmission Range: Up to 30.5 Meters (100 ft) Line of Sight Radio Power: 1 mW (0 dBm) Software HOBOconnect App for iOS and Android Note: Bluetooth 4.0 is Required on your Mobile Device (Phone or Tablet) OS Compatibility Android Phones and Tablets iPhone, iPad, iPod Touch with iOS 7.1 or Later Bluetooth 4.0 or Later Operating Range Temperature: -2°C to 50°C (28.4°F to 122°F) - Non-Freezing Standards Compliance CE, IP68 Environment Designed for Outdoor and Underwater Usage Materials Data Logger:PVC Housing and Sensor End Cap, Polycarbonate Closure Caps and Mounting End Cap with a TPE Switch pH Electrode: Plastic-Bodied with Pellon® Junctions and Gel Electrolyte, Glass pH Sensor Bulb Weight 286.2 grams (9.46 oz.) Dimensions 22.86 cm x 4.27 cm (9.0" x 1.68")