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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HOBO RX3000 Remote Weather Station Starter Kit
Measures barometric pressure, leaf wetness, light intensity, rainfall, relative humidity, soil moisture, temperature, and wind
$1,999.00
HOBO MX100 Temperature Data Loggers
Measures and transmits temperature data wirelessly to mobile devices via Bluetooth Low Energy (BLE) technology.
$45.00
In Stock
HOBO MX1101 Temperature / RH Data Loggers
Bluetooth Smart-enabled data logger is designed for wireless communication with Apple or Android mobile devices
$135.00
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
$133.00
HOBO RX3000 Remote Monitoring Station Data Logger
Cloud-based, 15-channel, multi-parameter data logger with plug-and-play convenience
$899.00
In Stock
HOBO EG4130 Pro Data Logger
Fully web-configurable indoor data logger with built-in web server & 30 sensor inputs, allows data to be retrieved locally or remotely
$850.00
In Stock
HOBO UX100 Temp/RH Data Logger
Temperature & humidity models available, 84,650 measurements, 1 second to 18 hours sampling rates
$75.00
In Stock
HOBO UX120 Series Data Loggers
Analog, thermocouple and pulse data logger options, high performance and high accuracy 4-channel data loggers
$139.00
In Stock
HOBO U12 Series Data Loggers
Multi-channel energy and environmental monitoring, records up to 4-channels, 43,000 measurements
$140.00
In Stock
HOBO U30-NRC Weather Station Starter Kit
Rugged data logging weather station with out-of-the-box convenience
$1,459.00
HOBO EG4115 Core Data Logger
Fully web-configurable indoor data logger with built-in web server & 15 sensor inputs, stores up to 64 data points
$499.00
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
$595.00
HOBO MX2300 Series Data Loggers
Bluetooth low energy-enabled loggers designed for wireless communication with a mobile device, weatherproof housing
$110.00
In Stock
HOBO U20L Series Water Level Loggers
Water Level, barometric pressure, pressure (absolute), temperature measurements, used in wide range of environmental applications
$299.00
In Stock
HOBO MX1102 Carbon Dioxide Data Logger
Bluetooth Smart enabled data logger stores and wirelessly transmits CO2, temperature and humidity readings
$595.00
In Stock
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
$220.00
In Stock
HOBO UX90 Series Data Loggers
Fast reliable measurements of state, pulse, event, runtime, light on/off, motor on/off, occupancy/light
$92.00
In Stock
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
$604.00
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
$129.00
HOBO ZW Series Wireless Data Loggers
Wirelessly monitor and transmit real-time building performance data, scales up to a network of 100 nodes
$186.00
HOBO H22-001 Energy Data Logger
Records up to 15 channels, 512K nonvolatile flash data storage, for energy and industrial monitoring applications
$364.00
HOBO U20 Water Level Data Loggers
Water level, pressure & temperature, ideal for wells, streams, lakes, and freshwater wetlands
$495.00
In Stock
HOBO MX2501 pH and Temperature Data Logger
Long-term monitoring of pH in both freshwater and saltwater environments
$695.00
HOBO U12-008 Data Logger
4-Channel external data logger can employ multiple energy and environmental sensors, ranging from amps to temperature
$249.00
HOBO Pendant Temperature / Alarm Data Loggers
Economical, weatherproof, and waterproof temperature data loggers designed for a variety of short and long term monitoring applications
$42.00
HOBO U23 Series Pro v2 Loggers
Weatherproof loggers for outdoor temperature and humidity measurements, high-accuracy measurements
$145.00
HOBO U24 Series Conductivity Data Loggers
Non-contact capacitive sensor, conductivity monitoring for freshwater and stable saltwater applications
$750.00
In Stock
HOBO UX120-018 Plug Load Data Logger
Measures power and energy consumption of 120V office equipment plug loads, 0.5% accuracy
$239.00
In Stock
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
$272.00
HOBO RG3 / RG3-M Rain Gauge Data Logger
Rainfall and temperature measurements, aluminum housing and 15.4 cm (6.06 in) collector ring
$420.00
HOBO MX2200 Series Data Loggers
Bluetooth low energy-enabled loggers designed for wireless communication with a mobile device, waterproof 100ft up to 5,000ft
$54.00
In Stock
HOBO U14 Series Data Loggers
Display, record, and get notified of temperature and humidity conditions, 43,000 measurements
$186.00
HOBO U26-001 DO Data Logger
DO and temperature monitoring, 0.2 mg/L accuracy, 0 to 30 mg/L measuring range
$1,250.00
In Stock
HOBO Pendant G Data Logger
Measurements of tilt, acceleration and motion, waterproof housing for wet or underwater use
$83.00
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
$139.00
In Stock
HOBO UA-003-64 Pendant Event Data Logger
Measures temperature, events and rainfall, event-based data storage provides detailed data and efficient memory usage
$105.00
HOBO Water Level Data Logger Deluxe Kit Series
Up to 100ft level depth, 13ft for barometric pressure, and temperatures from -4 to 122°F
$1,137.00
HOBO T-VER-PX3UL Differential Pressure Transducer
Measure either air pressure or velocity, unidirectional or bidirectional, switch selectable
$240.00
HOBO Accu-CT Current Transformer
Highly accurate split-core current transformer designed for single handed operation
$45.00
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
$99.00
In Stock
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
$249.00
In Stock
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
$207.00
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
$389.00
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
$495.00
HOBO TMC6-HE Temperature Sensor
Plated copper temperature sensor probe that can be mounted to a pipe or flat surface
$39.00
In Stock
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
$35.00
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
$410.00
HOBO RX3000 Data Plans
RX3000 remote monitors require a data plan selection in order to function
$0.00
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
$279.00
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
$249.00
HOBO CABLE-USBMB USB Cable
USB logger-to-PC communications cable, six feet long and coated in black plastic
$10.00
In Stock
HOBO BASE-U-4 Optic USB Base Station
Used to offload data from any HOBO data logger with an Optic USB interface, splash resistant
$124.00
In Stock
HOBO SOLAR-5W / SOLAR15W Solar Panels
5 Watt and 15 Watt solar panels work with the RX3000 and the U30-NRC, reduce system costs
$79.00
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
$150.00
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
$560.00
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
$189.00
In Stock
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
$150.00
HOBO T-ION-TVOC Volatile Organic Compound Sensor
Measures volatile organic compounds with TVOC sensor, selectable measuring ranges of 10, 100 and 1000 ppm
$3,999.00
HOBO 12-bit Temperature/RH Smart Sensors
Temperature and RH measurements
$189.00
HOBO F900 Air Velocity Sensor Series
Up to 10 m/s (1969 fpm) measurement range, designed for indoor environments
$280.00
HOBO S-LIB Solar Radiation Sensor
Solar Radiation (Silicon Pyranometer) Sensor, measurement range: 0 to 1280 W/m²
$210.00
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
$35.00
In Stock
HOBO CTV Series AC Current Sensors
Split-core AC Current Sensor, measures as low as 2 amps and as high as 600 amps
$95.00
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.
$139.00
HOBO AC-SENS-1 Power Adapter
AC Power Adapter for 3rd Party Sensors up to 400mA @12vdc
$29.00
HOBO WattNode 1 / 2 / 3 Phase Wye kWh Transducer Sensor
Measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations
$229.00
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
$279.00
HOBO ZW-RCVR Data Receiver
Collects incoming logged sensor data from HOBO data nodes and transfers the data to the computer via USB cable
$219.00
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
$245.00
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
$25.00
In Stock
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
$85.00
In Stock
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
$410.00
HOBO T-VER-E50B2 Power / Energy Meter
True RMS up to the 21st harmonic 60 Hz, One to three phase AC system
$625.00
Hobo RXMOD-A1 Analog Module
Includes four analog inputs that support excitation power, scaling, and statistics measurements
$120.00
In Stock
HOBO RXW-LIB-900 Wireless Solar Radiation Sensor
HOBOnet silicon pyranometer sensor is calibrated to measure light intensity for frequencies relevant for solar radiation
$299.00
HOBO UCC Series Pulse Input Adapters
Connects sensors with pulse outputs to loggers with smart-sensor inputs
$74.00
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
$95.00
HOBO S-SMD Soil Moisture Smart Sensor
Measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture
$139.00
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
$249.00
HOBO BASE-U-1 Optic USB Base Station
Fast optical infrared (IR) communication for easy logger launch and readout of HOBO Pendant loggers
$70.00
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
$281.00
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
$45.00
HOBO Direct Read Cable
Connects top end of waterl level data loggers to the sensor end to form a complete system
$90.00
HOBO Power Adapters
AC power adapters for use with HOBO RX3000 data loggers
$39.00
In Stock
HOBO Voltage Input Cable
External input cable with 13mm (0.5") tinned braided wire leads, 1.8 m (6 foot) long cable
$10.00
HOBO Compliance Certificate
Compliance certificate states that the individual data logger is in compliance with its specification as described in its product manual
$25.00
HOBO S-BPB-CM50 Barometric Pressure Smart Sensor
Barometric Pressure Smart Sensor for use with the RX3000 Remote Monitoring Station Data Logger
$249.00
HOBO TC6 Series Beaded Thermocouple Probes
6 feet in length, type J, K or T thermocouples,
$19.00
HOBO S-EXT Smart Sensor Extension Cable
Male-to-male extender cable, plus a female-to-female adaptor
$20.00
HOBO CABLE-PC-3.5 Interface Cable
Interface Cable for PCs
$20.00
HOBO DC Power Cable
External DC power cable for HOBO RX3000 data logger
$25.00
In Stock
HOBO HOUSING-U2X Protective Housing
The HOUSING-U2X Housing is for use in Underwater environments
$46.00
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
$47.00
HOBO TMC6-HC Stainless Steel Temperature Probe
6 foot Stainless Steel Temperature Probe
$87.00
HOBO S-LWA Leaf Wetness Smart Sensor
Measurement range: 0 (dry) to 100% (wet), capacitive grid sensor type
$132.00
HOBO MX2500 Electrode Storage Solution
Used to properly store and condition the pH electrode that is used with the HOBO MX pH Logger
$20.00
HOBO UCD Series Contact Closure Input Adapter
Connects sensors with pulse outputs to loggers with smart-sensor inputs, compatible with contact closures
$74.00
HOBO Voltage Input Adapter Sensor
Digital filtering improves measurement accuracy with 32 readings/sample, 12-bit resolution
$79.00
In Stock
Hobo RXMOD-R1 Relay Module
Allows for up to three individual relays to be activated or pulsed in response to alarms
$120.00
In Stock
HOBO Rogowski Coil Sensor
Flexible self powered rope CT designed to be used where regular split core CTs cannot fit
$125.00
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
$139.00
HOBO ZW-ROUTER Data Router
Routes data from networked HOBO data logger to ensure the data is transmitted back to the receiver
$175.00
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
$12.00
In Stock
HOBO M-CAA Full Cross Arm Mounting
Full cross arm mounting of two wind sensors for use with Onset tripods or masts
$72.00
HOBO RXMOD-RXW-900 Wireless Manager
Module and mote for installation in a RX3000 station, and designed to work with HOBOnet wireless sensor network
$149.00
In Stock
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
$239.00
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
$249.00
HOBO U-DT-1 Shuttle Data Transporter
Reads out data from systems in the field for transfer to a host computer
$281.00
HOBO S-WDA Wind Direction Smart Sensor
Research-grade plug-and-play sensor for measuring and logging wind direction data
$350.00
HOBO MX2500 Guard
Anti-Biofouling Copper Guard can be used in addition to the standard electrode guard
$20.00
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
$35.00
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
$55.00
HOBO MX2500 Maintenance Kit
The Maintenance Kit includes the Calibration Kit (MX2500-CAL-KIT) and Storage Solution (MX2500-STORE-SOLN)
$65.00
HOBO CSV-A8 AC Current Switch Sensor
Measure run-time (time-of-use) of equipment when combined with compatible HOBO data logger
$92.00
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
$269.00
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
$660.00
In Stock
HOBO Veris Kilowatt Transducer Sensor
Three 100 amp split core current transformers, 480 Volts AC rms input voltage
$845.00
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
$45.00
HOBO ADAPT-SER-USB USB Interface Cable
Keyspan USB-to-serial adaptor for use with all RS-232 serial devices and a PC 3.5 Interface cable for PC computers
$59.00
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
$79.00
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
$129.00
In Stock
HOBO S-LIA Photosynthetic Light Smart Sensor
Photosynthetically Active Radiation (PAR) Smart Sensor, designed to detect photons between 400-700 nm in wave length
$220.00
HOBO RXW-LIA-900 Wireless PAR Sensor
HOBOnet sensor measures photosynthetically active radiation (PAR) and light intensity for frequencies relevant to photosynthesis
$309.00
HOBO S-EXT-CASE2 Weatherproof Extension Housing
6.5-inch long, xenoy weatherproof housing that protects the connection between sensors and sensor extension cables
$30.00
HOBO CASE-4X-2 Enclosure
NEMA 4X weather-resistant enclosure
$59.00
HOBO U26-RDOB-1 DO Sensor Cap
Replacement dissolved oxygen sensor cap that has a 2-year shelf life and 6-month deployment life
$85.00
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
$249.00
HOBO MX2500 Calibration Beaker
4 oz calibration beaker can be used to calibrate the HOBO MX pH Logger and to store calibration solutions.
$4.00
HOBO COUPLER2-B Replacement Coupler
Replacement Coupler for U20 Water Level Loggers
$11.00
HOBO CABLE-ADAP5 Input Adapter Cable
External Input Cable to Measure DC Voltage: For 0-5 Vdc Max.
$12.00
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.
$14.00
HOBO Well Cap
2” Well Cap with suspension disk for HOBO MX2001 water level data loggers
$49.00
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
$89.00
HOBO MX2500 End Cap
Replaces the original sensor end cap that ships with the HOBO MX pH Logger
$95.00
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
$95.00
HOBO MX2500 Replacement Electrode
Replacement pH electrode, suited for environmental monitoring of streams, lakes, rivers, estuaries, and oceans
$115.00