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The HOBO MX2301 is a weatherproof data logger with built-in temperature and relative humidity sensors. Leveraging Bluetooth Low Energy, the logger enables easy, fast set up and data download directly from your mobile device, and provides high-accuracy measurements in harsh outdoor environments.
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Highlighted Features
Convenient wireless setup and download via Bluetooth Low Energy (30m)
Retrieve data in hard-to-reach locations
Visual alarms alert you to out-of-range conditions
Compact, weatherproof housing with built-in mounting
View current data in real time with Onset’s free HOBOmobile app
Share downloaded data easily from your mobile device
Accuracy: +/- 0.2C° and +/- 2.5% RH
| Property | Value |
|---|---|
| Range | MX2301A and MX2305 internal sensors: -40 to 70°C (-40 to 158°F) |
| Accuracy | ±0.25°C from -40 to 0°C (±0.45 from -40 to 32°F); ±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F) |
| Resolution | 0.02°C (0.036°F) |
| Drift | <0.01°C (0.018°F) per year |
| Memory | 128 KB (63,488 measurements, maximum) |
| Radio Power | 1 mW (0 dBm) |
| Transmission Range | Approximately 30.5 m (100 ft) line-of-sight |
| Wireless Data Standard | Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0) |
| Logger Operating Range | -40° to 70°C (-40° to 158°F) |
| Logging Rate | 1 second to 18 hours |
| Logging Modes | Fixed interval (normal, statistics) or burst |
| Memory Modes | Wrap when full or stop when full |
| Start Modes | Immediate, push button, date & time, or next interval |
| Stop Modes | When memory full, push button, date & time, or after a set logging period |
| Time Accuracy | ±1 minute per month 0° to 50°C (32° to 122°F) |
| Battery Type | 2/3 AA 3.6 Volt lithium, user replaceable |
| Battery Life | 2 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life. |
| Full Memory Download Time | Approximately 60 seconds; may take longer the further the device is from the logger |
| Dimensions | Logger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.); solar radiation shield bracket: 10.8 x 8.3 cm (4.25 X 3.25 in.) |
| Weight | Logger: 75.5 g (2.66 oz) Solar radiation shield bracket: 20.4 g (0.72 oz) |
| Materials | Acetal, silicone gasket, stainless steel screws |
| Environmental Rating | NEMA 6 and IP67 |
| Relative Humidity Range | 0 to 100% RH, -40° to 70°C (-40° to 158°F); exposure to conditions below -20°C (-4°F) or above 95% RH may temporarily increase the maximum RH sensor error by an additional 1% (per RH sensor manufacturer datasheet) |
| Relative Humidity Accuracy | ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% RH and above 90% RH ±5% typical (per RH sensor manufacturer datasheet) |
| Relative Humidity Resolution | 0.01 % |
| Relative Humidity Drift | <1% per year typical (per RH sensor manufacturer datasheet) |
| Temperature Response Time | Typical, to 90% of change: 17 minutes in air moving 1 m/sec (without solar radiation shield); 24 minutes in air moving 1 m/sec (with RS1/M-RSA solar radiation shield) |
| Relative Humidity Response Time | Typical, to 90% of change: 30 seconds in air moving 1 m/sec (without solar radiation shield); 40 seconds in air moving 1 m/sec (with RS1/M-RSA solar radiation shield) |
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