Based on Cape Cod, Massachusetts, Onset has sold more than 2.5 million data loggers since the company’s founding in 1981. Onset has designed and manufactured its HOBO data loggers on-site at its headquarters on Cape Cod, Massachusetts for more than 30 years. read more

Onset is a world leader in data loggers. Their HOBO data logger and weather station products are used around the world in a broad range of monitoring applications, from verifying the performance of green buildings and renewable energy systems to agricultural and coastal research.

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Available Products by HOBO Data Loggers by Onset

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HOBO MX1101 Temperature / RH Data Loggers
Bluetooth Smart-enabled data logger is designed for wireless communication with Apple or Android mobile devices
In Stock
HOBO RX3004 Remote Weather Station Starter Kit
Measures barometric pressure, leaf wetness, light intensity, rainfall, relative humidity, soil moisture, temperature, and wind
HOBO UX120 Series Data Loggers
Analog, thermocouple and pulse data logger options, high performance and high accuracy 4-channel data loggers
In Stock
HOBO UX100 Temp/RH Data Logger
Temperature & humidity models available, 84,650 measurements, 1 second to 18 hours sampling rates
In Stock
HOBO RX3000 Remote Monitoring Station Data Logger
Cloud-based, research-grade data logging weather station with plug-and-play convenience
In Stock
HOBO MX2300 Series Data Loggers
Bluetooth low energy-enabled temperature and humidity loggers designed for wireless communication with a mobile device
In Stock
HOBO MX2001 Water Level Data Logger
Water level data logger offers convenient wireless setup and download from mobile devices via Bluetooth Low Energy technology
HOBO U12 Series Data Loggers
Multi-channel energy and environmental monitoring, records up to 4-channels, 43,000 measurements
In Stock
HOBO TidbiT v2 Temperature Data Logger
Waterproof to 300 meters (1,000 feet), durable logger for measuring water temperature, 12-bit resolution, ±0.2°C accuracy
HOBO Pendant Temperature Data Loggers
Economical, weatherproof, and waterproof temperature data loggers designed for short and long term monitoring applications
HOBO EG4115 Core Data Logger
Fully web-configurable indoor data logger with built-in web server & 15 sensor inputs for current, voltage, power and more
HOBO RG3 / RG3-M Rain Gauge Data Logger
Rainfall and temperature measurements, aluminum housing and 15.4 cm (6.06 in) collector ring
HOBO U20L Series Water Level Loggers
Water Level, barometric pressure, pressure (absolute), temperature measurements, used in wide range of environmental applications
HOBO MX100 Temperature Data Loggers
Measures and transmits temperature data wirelessly to mobile devices via Bluetooth Low Energy (BLE) technology.
In Stock
HOBO MX2200 Series Data Loggers
Waterproof, Bluetooth low energy-enabled temperature loggers designed for wireless communication with a mobile device
In Stock
HOBO U30-NRC Weather Station Starter Kit
Rugged data logging weather station with out-of-the-box convenience
HOBO H21-USB Micro Station Data Logger
Weatherproof data logger for multi-channel monitoring of microclimates, accepts up to five plug-and-play Smart Sensors
HOBO ZW Series Wireless Data Loggers
Wirelessly monitor and transmit real-time building performance data, scales up to a network of 100 nodes
HOBO U20 Water Level Data Loggers
Water level, pressure & temperature, ideal for wells, streams, lakes, and freshwater wetlands
In Stock
HOBO MicroRX Station Data Logger
16 MB memory, 1 million measurements, continuous logging with up to 10-minute connection rates via 4G cellular data plans
HOBO UX120-018 Plug Load Data Logger
Measures power and energy consumption of 120V office equipment plug loads, 0.5% accuracy
In Stock
HOBO EG4130 Pro Data Logger
Fully web-configurable indoor data logger with built-in web server & 30 sensor inputs for power, voltage, current and more
In Stock
HOBO UX90 Series Data Loggers
Fast reliable measurements of state, pulse, event, runtime, light on/off, motor on/off, occupancy/light
In Stock
HOBO MX2501 pH Data Logger
Bluetooth low energy-enabled monitoring of pH in both freshwater and saltwater environments
HOBO U22 Water Temperature Pro v2 Data Logger
Waterproof to 120 meters (400 feet), durable streamlined case for extended deployment in fresh or salt water
HOBO UX100-014M Thermocouple Data Logger
Indoor single channel thermocouple data logger, types J, K, T, E, R, S, B, or N with temperature ranges from -436 to 3,308°F
In Stock
HOBO MX1102 Carbon Dioxide Data Logger
Bluetooth Smart enabled data logger stores and wirelessly transmits CO2, temperature and humidity readings
In Stock
HOBO U26-001 Dissolved Oxygen Data Logger
DO and temperature monitoring, 0.2 mg/L accuracy, 0 to 30 mg/L measuring range
HOBO U23 Series Pro v2 Loggers
Weatherproof loggers for outdoor temperature and humidity measurements, high-accuracy measurements
HOBO U12 Series Temperature Data Logger
Food-grade 316 Series stainless Steel, 43,000 measurements, -40 to 257°F (-40 to 125°C) temp range
HOBO H22-001 Energy Data Logger
Records up to 15 channels, 512K nonvolatile flash data storage, for energy and industrial monitoring applications
HOBO Pendant G Data Logger
Measurements of tilt, acceleration and motion, waterproof housing for wet or underwater use
HOBO MX Multi-Channel Data Loggers
Uses Bluetooth Low Energy (BLE) technology to transmit indoor monitoring data to mobile devices
In Stock
HOBO U12-008 Data Logger
4-Channel external data logger can employ multiple energy and environmental sensors, ranging from amps to temperature
HOBO U24 Series Conductivity Data Loggers
Non-contact capacitive sensor, conductivity monitoring for freshwater and stable saltwater applications
HOBO U14 Series Data Loggers
Display, record, and get notified of temperature and humidity conditions, 43,000 measurements
HOBO UA-003-64 Pendant Event Data Logger
Measures temperature, events and rainfall, event-based data storage provides detailed data and efficient memory usage
HOBO Water Level Data Logger Deluxe Kit Series
Up to 100ft level depth, 13ft for barometric pressure, and temperatures from -4 to 122°F
HOBO U20 Water Level Data Logger Starter Kit
Kit includes: U20-001-01 HOBO data logger (13', 30', 100' ranges available), BASE-U-4 Base Station and HOBOware Pro Software
HOBO Rogowski Coil Sensor
Flexible self powered rope CT designed to be used where regular split core CTs cannot fit
In Stock
USB logger-to-PC communications cable, six feet long and coated in black plastic
In Stock
HOBO RXW-SMC-900 Wireless Soil Moisture Sensor
HOBOnet sensor with range of 1,500 to 2,000ft, wireless mesh self-healing technology, and up to 50 wireless sensors per network
HOBO RXW-RGF-900 Wireless Rain Gauge Sensor
HOBOnet sensor measures in 0.2mm increments, and includes bird spikes and locking debris screen to minimize interference
HOBO HOBOware Pro Software
Plot or export data to spreadsheets, time saving tools to fast setup, readout and export, compatible with all HOBO data loggers
In Stock
HOBO RXW-TMB-900 Wireless Temperature Sensor
HOBOnet high-accuracy sensor with stainless steel tip rated for immersion in water or soil up to 122°F for up to 1 year
In Stock
Routes data from networked HOBO data logger to ensure the data is transmitted back to the receiver
HOBO CDI-5200 / CDI-5400 Compressed Air Flow Meters
Adds the ability for users to be able to measure compressed air flow (SCFM), fits 1 inch or 2 inch steel pipes
HOBO ACT-0750 Split-Core Current Transformers
Accu-CT revenue-grade, split-core current transformer, 20, 50, 100 and 250 A range options, one-handed opening and closing mechanism
HOBO EG4100 Series Current Transformer Sensor
Split-core CT sensor with multiple current ratings, overvoltage protection circuit & hinged body is easy to install in tight spaces
In Stock
HOBO U-DTW-1 Waterproof Shuttle Data Transporter
Compatible with all HOBO U-Series loggers with optic USB, waterproof up to 20m (66ft), requires HOBOware Pro software
HOBO BASE-U-4 Optic USB Base Station
Used to offload data from any HOBO data logger with an Optic USB interface, splash resistant
In Stock
HOBO RXW-WCF-900 Wind Speed and Direction Sensor
HOBOnet wireless sensor provides average wind speed, highest 3-second wind gust, and average wind direction
HOBO CTV Series AC Current Sensors
Split-core AC Current Sensor, measures as low as 2 amps and as high as 600 amps
HOBO S-SMC-M005 Soil Moisture Smart Sensor
Sensor uses a high-frequency (70 MHz) circuit that provides good accuracy even in high-salinity and sandy soils.
HOBO TMC6-HE Temperature Sensor
Plated copper temperature sensor probe that can be mounted to a pipe or flat surface
HOBO Self Describing Temperature Sensors
Self-Describing Air/Water/Soil Temperature Sensor for the MX1104 and MX1105 Data Loggers
HOBO RXW-RGE-900 Wireless Rain Gauge Sensor
HOBOnet sensor measures in 0.01in increments, and includes bird spikes and locking debris screen to minimize interference
HOBO T-MINOL-NL Water Flow Meter Sensor
Compact, no-lead water flow meter sensor that measures cold and hot water flow rates, with 59 inch cable length
HOBO MX Gateway
Automatically transmits HOBO MX Bluetooth Low Energy (BLE) logger data to cloud-based HOBOlink software
In Stock
HOBO RXW-SMD-900 Wireless Soil Moisture Sensor
HOBOnet sensor measures a 1-liter volume of soil and transmits data within a self-healing mesh network for greater reliability and range
HOBO BASE-U-1 Optic USB Base Station
Fast optical infrared (IR) communication for easy logger launch and readout of HOBO Pendant loggers
HOBO TMC6-HC Stainless Steel Temperature Probe
6 foot Stainless Steel Temperature Probe
HOBO RX Data Plans
RX remote monitors require a data plan selection in order to function
HOBO TMC Air/Water/Soil Temp Sensors
Measures temperature in air, water, or soil, 1 ft, 6 ft, 20 ft and 50 ft lengths available
HOBO S-WSB Wind Speed Smart Sensor
Measure wind speed from 0 to 76 m/s (0 to 170 mph), sensor survives through 170 mph
HOBO NIST Calibration
1- or 3-point NIST calibration for HOBO MX1101 temperature / RH data loggers
HOBO S-LIB Solar Radiation Sensor
Solar Radiation (Silicon Pyranometer) Sensor, measurement range: 0 to 1280 W/m²
HOBO MX Gateway HOBOlink Data Plan
1 minute logging and connection interval with unlimited cloud storage for 1 year, will expire and need to be renewed annually
In Stock
HOBO 4-20 mA Input Cable
For connecting a sensor with a 4-20mA output to a HOBO U12, UX120, or ZW series external-channel data logger
In Stock
HOBO CABLE-PC-3.5 Interface Cable
Interface Cable for PCs
HOBO S-RGA-M002 Rain Gauge Smart Sensor
0.01" Rain Gauge (2m cable) Smart Sensor, measures rainfall rates up to five inches per hour
HOBO RXW-RPTR-900 Wireless Repeater
HOBOnet repeater ideal for use for obstructions between network motes and the station, or to extend transmission range of motes
HOBO TC6 Series Beaded Thermocouple Probes
6 feet in length, type J, K or T thermocouples,
HOBO SOLAR-5W / SOLAR15W Solar Panels
5 Watt and 15 Watt solar panels work with the RX3000, MicroRX, and the U30-NRC, reduce system costs
HOBO S-WCG-M003 Ultrasonic Smart Sensor
Ultrasonic wind, speed and direction smart sensor, plug-and-play with HOBO stations
HOBO S-LIA Photosynthetic Light Smart Sensor
Photosynthetically Active Radiation (PAR) Smart Sensor, designed to detect photons between 400-700 nm in wave length
HOBO U-DT-1 Shuttle Data Transporter
Reads out data from systems in the field for transfer to a host computer
HOBO S-SMD Soil Moisture Smart Sensor
Measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture
HOBO 4-20 mA Input Adapter Sensor
Interfaces with any sensor providing a 4-20 mA signal to connect to smart sensor compatible data loggers
In Stock
HOBO 12-bit Temperature/RH Smart Sensors
Temperature and RH measurements
HOBO RXW-THC-900 Temperature and Relative Humidity Sensor
HOBOnet sensor includes wireless mesh self-healing technology, and withstands extended use in high-humidity environments
HOBO TCP6-K12 Probe Thermocouple Sensor
12" (30cm) stainless steel probe, 3/16” (0.5cm) in diameter, 32 to 1650°F (0 to 900°C) measuring range
HOBO RXW-LIB-900 Wireless Solar Radiation Sensor
HOBOnet silicon pyranometer sensor is calibrated to measure light intensity for frequencies relevant for solar radiation
HOBO MX2001 Water Level Sensors
Water level data logger offers convenient wireless setup and download from mobile devices via Bluetooth Low Energy technology
HOBO MX2500 pH Calibration Solutions
pH 4.01, 7.00, and 10.00 Calibration Solutions (475 mL bottles) are used to calibrate the pH electrode in the HOBO MX pH Logger.
HOBO DC Voltage External Input Cable
Provide analog sensor inputs of 0 to 5, 10 or 24 VDC, 1.9 m (6.3 ft) long cable
In Stock
Hobo RXMOD-A1 Analog Module
Includes four analog inputs that support excitation power, scaling, and statistics measurements
In Stock
HOBO U26-RDOB-1 DO Sensor Cap
Replacement dissolved oxygen sensor cap that has a 2-year shelf life and 6-month deployment life
HOBO CSV-A8 AC Current Switch Sensor
Measure run-time (time-of-use) of equipment when combined with compatible HOBO data logger
HOBO Weather Station Tripod Kit
Tripod kit for HOBO Weather Station or HOBO Micro Station, 6.5 or 9.8ft
HOBO Voltage Input Cable
External input cable with 13mm (0.5") tinned braided wire leads, 1.8 m (6 foot) long cable
Keyspan USB-to-serial adaptor for use with all RS-232 serial devices and a PC 3.5 Interface cable for PC computers
HOBO CASE-4X-2 Enclosure
NEMA 4X weather-resistant enclosure
HOBO RXMOD-RXW-900 Wireless Manager
Module and mote for installation in a RX3000 station, and designed to work with HOBOnet wireless sensor network
In Stock
HOBO S-RGB-M002 Rainfall Smart Sensor
0.2 mm Rainfall (2m cable) Smart Sensor, measures rainfall rates up to 12.7 cm per hour
HOBO COUPLER2-B Replacement Coupler
Replacement Coupler for U20 Water Level Loggers
HOBO Accu-CT Current Transformer
Highly accurate split-core current transformer designed for single handed operation
HOBO Direct Read Cable
Connects top end of waterl level data loggers to the sensor end to form a complete system
HOBO S-LWA Leaf Wetness Smart Sensor
Measurement range: 0 (dry) to 100% (wet), capacitive grid sensor type
HOBO T-VER-E50B2 Power / Energy Meter
True RMS up to the 21st harmonic 60 Hz, One to three phase AC system
HOBO ZW-RCVR Data Receiver
Collects incoming logged sensor data from HOBO data nodes and transfers the data to the computer via USB cable
HOBO T-MAG-SCT Series AC Transformer
Split-core design for fast, easy installation, up to 600A measurements, accuracy at 10% to 130% of rated current
HOBO WattNode Branch Circuit Transducer Sensor
Measures up to 3 separate branch circuits simultaneously, accurate measurement of multiple single phase or each phase of 3-phase configurations
HOBO S-WSET-B Wind Smart Sensor Set
Set includes research-grade plug-and-play Wind Speed Smart Sensor and the Wind Direction Smart Sensor
HOBO Power Adapters
AC power adapters for use with HOBO RX3000 data loggers
In Stock
HOBO MX2500 Calibration Kit
The Calibration Kit includes pH 4.01, pH 7.00, pH 10.00 buffer solutions (475 mL bottles), and the 4 oz. calibration beaker
HOBO U-DT-2 U30 Shuttle Data Transporter
Reads out data from systems in the field for transfer to a host computer, preserves data in nonvolatile memory
HOBO TMB Series 12-Bit Temperature Smart Sensors
Temp, and water temp measurements, stainless steel sensor tip and robust cable, 2m, 6m and 17m length options
HOBO WattNode 1 / 2 / 3 Phase Wye kWh Transducer Sensor
Measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations
HOBO Veris Kilowatt Hour 1-Phase / 3-Phase Transducers
300 or 800 amp sensors, split-core installation eliminates the need to remove conductors, accurate electronic pulse output
In Stock
HOBO Compliance Certificate
Compliance certificate states that the individual data logger is in compliance with its specification as described in its product manual
Call for pricing
HOBO MX2500 Electrode Storage Solution
Used to properly store and condition the pH electrode that is used with the HOBO MX pH Logger
HOBO HOUSING-U2X Protective Housing
The HOUSING-U2X Housing is for use in Underwater environments
1, 5, 10, 15, 30, and 60 meter cables available
HOBO T-VER-PX3UL Differential Pressure Transducer
Measure either air pressure or velocity, unidirectional or bidirectional, switch selectable
HOBO T-VER-971BP-200 Split-Core Bi-Polar DC Transducer
Measures up to 200 Amps of DC current in both flow directions, adjustable span range
HOBO S-BPB-CM50 Barometric Pressure Smart Sensor
Barometric Pressure Smart Sensor for use with the HOBO Remote Monitoring Station Data Loggers
HOBO S-EXT Smart Sensor Extension Cable
Male-to-male extender cable, plus a female-to-female adaptor
HOBO DC Power Cable
External DC power cable for HOBO RX3000 data logger
HOBO Well Cap
2” Well Cap with suspension disk for HOBO MX2001 water level data loggers
HOBO M-CAA Full Cross Arm Mounting
Full cross arm mounting of two wind sensors for use with Onset tripods or masts
HOBO U26-GUARD-2 Antifouling Protective Guard
Replaces standard protective guard & uses copper windings to reduce bio-fouling while still allowing good water flow to the sensor
HOBO WNB-3D WattNode 3-Phase Series Transducers
Measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations, pulse output, use with wide variety of CT's
HOBO RXW-LIA-900 Wireless PAR Sensor
HOBOnet sensor measures photosynthetically active radiation (PAR) and light intensity for frequencies relevant to photosynthesis
HOBO S-WDA Wind Direction Smart Sensor
Research-grade plug-and-play sensor for measuring and logging wind direction data
HOBO Voltage Input Adapter Sensor
Digital filtering improves measurement accuracy with 32 readings/sample, 12-bit resolution
In Stock
HOBO MX2500 Calibration Beaker
4 oz calibration beaker can be used to calibrate the HOBO MX pH Logger and to store calibration solutions.
HOBO DC Voltage Input Cable
Self-Describing DC Voltage Input Cable for the MX1104 and MX1105 Data Loggers
HOBO AC-SENS-1 Power Adapter
AC Power Adapter for 3rd Party Sensors up to 400mA @12vdc
HOBO CABLE-ADAP5 Input Adapter Cable
External Input Cable to Measure DC Voltage: For 0-5 Vdc Max.
HOBO UCC Series Pulse Input Adapters
Connects sensors with pulse outputs to loggers with smart-sensor inputs
In Stock
HOBO ConLab AC Transmitter Sensors
Self-powered transformer for monitoring sine wave, single-phase AC voltage. 150 anf 300 volts RMS range options
HOBO S-WCC Marine Wind Monitor Adapter Sensor
Connects the R.M. Young Marine Wind Monitor Sensor (model 05106) with Onset's line of research-grade weather stations
HOBO S-WCB Wind Monitor Adapter Sensor
Connects the R.M. Young Wind Monitor-AQ Sensor (model 05305) with Onset's line of research-grade weather stations
HOBO S-EXT-CASE2 Weatherproof Extension Housing
6.5-inch long, xenoy weatherproof housing that protects the connection between sensors and sensor extension cables
HOBO MAG-0400 Series AC Current Transformers
Split-core design for fast, easy installation, measures up to 75A, output 0.333 Volt AC at rated current
HOBO SD-MA-420 Input Cable
4-20 mA input cable offers integrated strain relief to keep it connected to the logger,
HOBO MX2500 Maintenance Kit
The Maintenance Kit includes the Calibration Kit (MX2500-CAL-KIT) and Storage Solution (MX2500-STORE-SOLN)
HOBO UCD Series Contact Closure Input Adapter
Connects sensors with pulse outputs to loggers with smart-sensor inputs, compatible with contact closures
HOBO MAG-SPT Series AC Potential Transformers
Measures True RMS for accurate readings of sinusoidal and non-sinusoidal waveforms, ranges of 150, 300, 600 Volts AC
HOBO S-FS-CVIA FlexSmart Analog Module
2 input channels of 0 to 20mA and/or 0 to 20 VDC, provides 12V sensor excitation and user-configurable warm-up
Hobo RXMOD-R1 Relay Module
Allows for up to three individual relays to be activated or pulsed in response to alarms
In Stock
HOBO MX2500 Guard
Anti-Biofouling Copper Guard can be used in addition to the standard electrode guard
HOBO MX2500 End Cap
Replaces the original sensor end cap that ships with the HOBO MX pH Logger
HOBO MX2500 Replacement Electrode
Replacement pH electrode, suited for environmental monitoring of streams, lakes, rivers, estuaries, and oceans