All Parts & Accessories

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  • WELL-CAP-01

    This locking well cap provides convenient mounting for HOBO loggers in wells. Used with the HOBO MX2001 it supports the logger at the top of the well for optimal wireless transmission range.

  • AC-USB-1

    Featuring a compact design, this power adapter is used with our USB cable (#CABLE-USBMB sold seperately).This USB Power Adapter has fixed prongs for use in the U.S., Canada, Japan, Taiwan, and parts of Latin America.


    Onset offers testing and certification of HOBO data logger and sensor RH (relative humidity) accuracy using standards traceable to the U.S. National Institute of Standards & Technology (NIST). This includes single-point (50% RH @ 25C) or three-point (25, 50, 75% RH @ 25C) NIST certification. For each data logger certified, a certificate is provided showing the device’s RH and temperature accuracy vs. a NIST traceable standard. Certification is available for all currently manufactured Onset data loggers and sensors. 

    NOTE: The temperature value used for RH certification is fixed at 25C and verified against a NIST-traceable 200-ohm platinum RTD (resistance temperature detector). If additional temperature certification is required at temperature values other than 25C, Onset’s temperature NIST certification services must also be performed. Onset’s temperature NIST services offer certification in an oil-bath for user-selectable temperature points between -30 and 120C. If custom temperature points are desired additional cost and lead time will apply.

    Onset also offers NIST temperature certification, learn more.

    Frequently Asked Questions

    Q: Can I request RH NIST Certification for an existing logger that I already own?
    A: Yes, please fill out our technical support form for further instructions. 

    Q: Can I request RH NIST Certification for loggers no longer in production (like the H08 loggers)?
    A: Only Onset data loggers and sensors that are currently in production are available for RH NIST Certification

    Q: Does Onset RH NIST-certify data loggers made by other manufacturers?
    A: No, only currently-manufactured Onset data loggers and sensors are supported.

    Q: Will I get as-found data as part of this service?
    A: Onset data logger products and sensors are not adjustable to correct for drift over time. If your logger or sensor is found to be within acceptable RH limits the RH test data will be included on your certification report. If your logger or sensor is found to be out of tolerance you will be contacted by Onset Technical Support with a copy of your as-found data and offer options for repair or replacement.


    The lockable, vented security case provides complete enclosure protection for HOBO data loggers. It has air circulating ports on all four sides to ensure ample air circulation for proper data logger operation. Each guard has a permanently-attached, eight-tumbler type lock, and each kit is supplied with a key. Guard kits are available with two mounting base types: solid or ring. When using the ring base models, the guard can be mounted to the wall without removing the data logger.

    Items included are: Clear case cover, mounting screws, solid mounting base, ring mounting base, built-in lock with one key

  • RXMOD-R1

    The optional Relay Module allows for up to three individual relays to be activated or pulsed in response to alarms.  Each relay contact closure can be configured as normally open or normally closed through HOBOlink. A HOBO RX3000 is required for this product.


    The external DC power cable (CABLE-RX-PWR) is used to connect a user-supplied power source to the HOBO RX3000 Monitoring Station to charge the station’s internal battery. The external power source can be an intermittent power source, such as a 6W or larger solar panel. The external power source must be able to supply 6W, but the average power used will be much less and depends on the number and type of sensors, logging interval, and the frequency of internet connections.

  • RXMOD-A1

    The optional analog module has four analog inputs that support excitation power, scaling, and statistics measurements.  These four, single-ended sensor inputs are configured through HOBOlink. A HOBO RX3000 is required for this product.

  • U-DT-2

    The HOBO U-DT-2 U30 Shuttle Data Transporter provides convenient in-field data offload and relaunch of HOBO U30-NRC systems and HOBO Weather Stations (H21), Micro Stations, and HOBO Energy Logger systems (H22). The U30 Shuttle's 2 x 16-character display shows current readings (for selected data loggers), and logger status.

    NOTE: HOBOware Pro software required.

    Add Extended Warranty for $28.10/unit?

    Yes No thanks

    (this choice will apply to all existing U-DT-2 in your cartquote request)

  • U-DT-1

    Conveniently offload data in the field with the HOBO U-Shuttle Data Transporter. This product also allows users to easily relaunch HOBO U-series data loggers and HOBO Weather Stations, Micro Stations, and HOBO Energy Logger systems. View readings on a 2 x 16-character display for selected data loggers, and access logger status for all loggers. An Optic USB Base Station is required for use with optic USB data loggers.

    NOTE: HOBOware Pro software required.

    Add Extended Warranty for $28.10/unit?

    Yes No thanks

    (this choice will apply to all existing U-DT-1 in your cartquote request)

  • CASE-4X-2

    Onset’s NEMA 4X weather-resistant enclosure for mounting the HOBO UX120-014M data logger in wet, dusty, or condensing environments.  It is intended for short deployments where additional protection is needed.

  • HRB-TEMP-1

    5 Sony CR2032 lithium replacement batteries for data loggers. Note: Lithium batteries cannot be shipped on commercial airlines, and more than 24 cannot be shipped in a single box.


    The largest, most durable airline-legal carry-on available, the new 1510 Pelican case provides safe and convenient transport of your HOBO data logging equipment. This watertight, crush-proof, and dust-proof case features a sturdy but lightweight design that includes a Pick N Pluck™ foam interior, 17” retracting extension handle, strong polyurethane wheels, stainless steel hardware, padlock protectors, and a lifetime guarantee of excellence.

  • U22-U24-CAP

    U22 – U24 Communications Window Protective Cap (5-pack)

  • U23-CAP

    UV Protection Caps to U23 Series Data Loggers

  • U26-CAL-SOL

    Sodium Sulfite solution (500 mL) is used for calibrating the HOBO Dissolved Oxygen Logger at 0% saturation, which is optional.

    • Concentration: 5% w/v
  • U26-GUARD-2

    The Anti-fouling Protective Guard can be used in place of the standard protective guard for protection against fouling during deployment. The anti-fouling guard uses copper windings to reduce bio-fouling, while still allowing good water flow to the sensor.


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