HOBO MX2303 Two External Temperature Sensors Data Logger

Highlighted Features

Convenient wireless setup and download via Bluetooth Low Energy (100-foot range)
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°

Temperature Sensor

Range | MX2301A and MX2305 internal sensors: -40 to 70°C (-40 to 158°F)
MX2302A external temperature sensor: -40 to 70°C (-40 to 158°F)
MX2303 and MX2304 external sensors: -40 to 100°C (-40 to 212°F), with tip and cable immersion in fresh water up to 50°C (122°F) for one year
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)
±0.25°C from 70 to 100°C (±0.45 from 158 to 212°F), MX2303 and MX2304 only
Resolution | 0.04°C (0.072°F)
Drift | <0.01°C (0.018°F) per year
RH Sensor (MX2301A, MX2302A only)
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%
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
Resolution | 0.01%
Drift | <1% per year typical
Memory | 128 KB (63,488 measurements, maximum)

Response Time: Temperature (typical, to 90% of change)	Without Solar Radiation Shield	With RS1/M-RSA Solar Radiation Shield	With RS3-B Solar Radiation Shield
internal sensor	17 minutes in air moving 1 m/sec	24 minutes in air moving 1 m/sec	N/A
Response Time: RH (typical, to 90% of change)	Without Solar Radiation Shield	With RS1/M-RSA Solar Radiation Shield	With RS3-B Solar Radiation Shield
internal sensor	30 seconds in air moving 1 m/sec	40 seconds in air moving 1 m/sec	N/A

Logger

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 Power Saving Mode disabled; 5 years, typical with logging interval of 1 minute and Power Saving Mode enabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.
Memory | 128 KB (63,488 measurements, maximum)
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.)
External temperature sensor diameter: 0.53 cm (0.21 in.)
External temperature/RH sensor diameter: 1.17 cm (0.46 in.)
External sensor cable length: 2 m (6.56 ft)
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
| The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.