Price on request
A low-cost, research-grade data logger with Bluetooth data offload to continuously monitor water level and temperature. Measures at depths of up to 4, 9, or 30m in a wide range of underwater environments, both freshwater and saltwater.
Saves this product and the next ones you view in this browser, up to eight, for 30 days. You can disable it under “History” in the footer.
History is enabled in this browser. History
The MX20L Water Level Logger brings you all the same great features as the U20L and more!
Integrating Bluetooth for fast and reliable data download, the MX20L logger eliminates the need to plug your logger into a base station or shuttle to offload data in the field, ensuring continuous water level and temperature monitoring. With options to measure at depth ranges of 13, 30, or 100 feet in a wide range of underwater environments, this rugged logger features 0.1% measurement accuracy, a durable polypropylene housing for use in both freshwater and saltwater, and a non-vented design for convenient and reliable deployment.
The MX20L comes with a magnetic activation fob that can "wake up" the logger to activate its Bluetooth communication for configuration and data download. The included fob comes with a lanyard to prevent losing or dropping the fob in the field.
This logger records absolute pressure, which is later converted to water level readings by our HOBOconnect software. To compensate for barometric pressure changes, you can use another HOBO MX20L Water Level logger as a barometric reference. See our FAQ section for more information.
| Property | Value |
|---|---|
| Operation range (MX20L-01) | 0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude |
| Factory calibrated range (MX20L-01) | 69 to 207 kPa, 0° to 40°C (10 to 30 psia, 32° to 104°F) |
| Burst pressure (MX20L-01) | 310 kPa or 18 m depth (45 psia or 60 ft depth) |
| Water level accuracy (MX20L-01; with accurate reference water level measurement, known water density, accurate barometric compensation data, and a stable temperature environment) | Typical error: ±0.1% FS, 1.0 cm (0.03 ft) Water; Maximum error: ±0.2% FS, 2.0 cm (0.06 ft) Water |
| Raw pressure accuracy (MX20L-01; includes all sensor drift, temperature, and hysteresis-induced errors) | ±0.3% FS, 0.62 kPa (0.09 psi) Maximum error |
| Pressure resolution (MX20L-01) | <0.02 kPa Water (0.007 ft Water) |
| Pressure response time (90%, MX20L-01) | <1 second at a stable temperature (measurement accuracy also depends on temperature response time; allow 20 minutes in water to achieve full temperature compensation; maximum error due to rapid thermal changes is approximately 0.5%) |
| Operation range (MX20L-02) | 0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude |
| Factory calibrated range (MX20L-02) | 69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F) |
| Burst pressure (MX20L-02) | 500 kPa (72.5 psia) or 40.8 m (134 ft) Depth |
| Water level accuracy (MX20L-02; with accurate reference water level measurement, known water density, accurate barometric compensation data, and a stable temperature environment) | Typical error: ±0.1% FS, 3.0 cm (0.1 ft) Water; Maximum error: ±0.2% FS, 6.0 cm (0.2 ft) Water |
| Raw pressure accuracy (MX20L-02; includes all sensor drift, temperature, and hysteresis-induced errors) | ±0.3% FS, 1.20 kPa (0.17 psi) Maximum error |
| Pressure resolution (MX20L-02) | <0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) Water |
| Pressure response time (90%, MX20L-02) | <1 second at a stable temperature (measurement accuracy also depends on temperature response time; allow 20 minutes in water to achieve full temperature compensation; maximum error due to rapid thermal changes is approximately 0.5%) |
| Operation range (MX20L-04) | 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude |
| Factory calibrated range (MX20L-04) | 69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F) |
| Burst pressure (MX20L-04) | 310 kPa (45 psia) or 18 m (60 ft) Depth |
| Water level accuracy (MX20L-04; with accurate reference water level measurement, known water density, accurate barometric compensation data, and a stable temperature environment) | Typical error: ±0.1% FS, 0.4 cm (0.013 ft) Water; Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) Water |
| Raw pressure accuracy (MX20L-04; includes all sensor drift, temperature, and hysteresis-induced errors) | ±0.3% FS, 0.43 kPa (0.063 psi) Maximum error |
| Pressure resolution (MX20L-04) | <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) Water |
| Pressure response time (90%, MX20L-04) | <1 second at a stable temperature (measurement accuracy also depends on temperature response time; allow 20 minutes in water to achieve full temperature compensation; maximum error due to rapid thermal changes is approximately 0.5%) |
| Temperature operation range | -20° to 50°C (-4° to 122°F) |
| Temperature accuracy | ±0.2°C from 0° to 50°C (±0.36°F from 32° to 122°F) |
| Temperature resolution | 0.10°C at 25°C (0.18°F at 77°F) |
| Temperature response time (90%) | 10 minutes in water (typical) |
| Temperature stability (drift) | 0.1°C per year (0.18°F per year) |
| Wireless standard | Bluetooth 5 LE |
| Transmission range | approximately 30.5 m (100 ft) line-of-sight |
| Radio power | 1 mW (0 dBm) |
| Real-time clock | ±1 minute per month 0° to 50°C (32° to 122°F) |
| Battery | 2/3 AA, 3.6 Volt lithium, factory-replaceable |
| Battery life (typical use) | 3 years with 1-minute logging and Bluetooth always on; 7 years with 1-minute logging and Bluetooth off and LED off; 10 years with 5-minute logging and Bluetooth off and LED off |
| Battery indication | Battery status shown in HOBOconnect app (approximate) |
| Memory (non-volatile) | approximately 400,000 sets of pressure and temperature measurements |
| Data download time (with Bluetooth 5+ devices) | approximately 3.5 minutes; 100,000 measurements < 1 minute |
| Weight in air | approximately 154 g (5.43 oz) |
| Weight in fresh water | approximately 53.9 g (1.9 oz) |
| Dimensions | 3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter |
| Wetted materials | Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetal end cap; stainless steel screws suitable for saltwater |
| Logging modes | Fixed-interval (normal or statistics), burst or multiple intervals with up to 8 user-defined intervals and durations; logging intervals from 1 second to 18 hours |
| Start modes | Immediate, next interval, date & time, button start (fob or app) |
| Stop modes | Memory full, never stop (overwrite oldest data), date & time, or after set logging period |
| Pause | Pause and restart with HOBOconnect app |
| Alarms | Log high- or low-alarm events; alarm status shown in HOBOconnect app |
| Environmental rating | IP68 |
LI-COR (HOBO, InTemp, LI-COR) · MX20-04
Delivering the highest accuracy in a rugged design, the wireless MX20 data logger provides research-grade measurements for professional water level monitoring applications in both freshwater and saltwater environments, and features convenient Bluetooth for…
LI-COR (HOBO, InTemp, LI-COR) · MX2203
The HOBO MX2203 TidbiT waterproof temperature logger leverages the power of Bluetooth Low Energy (BLE) to deliver high-accuracy temperature measurements straight to your iOS or Android mobile device. Designed for durability, this rugged waterproof logger is…
LI-COR (HOBO, InTemp, LI-COR) · MX2501
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…
LI-COR (HOBO, InTemp, LI-COR) · MX801 • MX802
Highly configurable, wireless multiparameter loggers that integrate sensors (purchased separately) for measuring water conductivity/salinity, temperature, level, and dissolved oxygen
Tell EIC Controls about your application.