Vernier Software and Technology
Vernier Software & Technology

Go Direct® Temperature Probe User Manual

Go Direct® Temperature Probe

Go Direct Temperature can be used as a thermometer for experiments in chemistry, physics, biology, Earth science, environmental science, and more.

Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.

What's Included

  • Go Direct Temperature
  • Micro USB Cable

Compatible Software

Getting Started

Please see the following link for platform-specific connection information:

Bluetooth Connection

USB Connection

  1. Install Graphical Analysis 4 on your computer, Chromebook™, or mobile device. See for software availability.
  2. Charge your sensor for at least 2 hours before first use.
  3. Turn on your sensor by pressing the power button once. The Bluetooth® LED will blink red.
  4. Launch Graphical Analysis 4.
  5. Click or tap Sensor Data Collection.
  6. Click or tap your Go Direct sensor from the list of Discovered Wireless Devices. Your sensor's ID is located near the barcode on the sensor. The Bluetooth LED will blink green when it is successfully connected.
  7. Click or tap Done to enter data-collection mode.
  1. Install Graphical Analysis 4 on your computer or Chromebook. If using LabQuest 2, make sure LabQuest App is up to date. See for software availability or to update LabQuest App.
  2. Connect the sensor to the USB port.
  3. Launch Graphical Analysis 4 or turn on LabQuest 2. You are now ready to collect data.

Charging the Sensor

Connect Go Direct Temperature to the included Micro USB Cable and any USB device for two hours.

You can also charge up to eight Go Direct Temperature Probes using our Go Direct Charge Station, sold separately (order code: GDX-CRG). An LED on each Go Direct Temperature indicates charging status.


Blue LED on steady while sensor is connected to the Charging Cable or Charge Station.

Fully charged

Blue LED is off when charging is complete.

Providing Power

Turning on the sensor

Press button once. Red LED indicator flashes when unit is on.

Putting the sensor in sleep mode

Press and hold button for more than three seconds to put into sleep mode. Red LED indicator stops flashing when sleeping.

Connecting the Sensor

See the following link for up-to-date connection information:

Connecting via Bluetooth

Ready to connect Red LED flashes when sensor is awake and ready to connect via Bluetooth.
Connected Green LED flashes when sensor is connected via Bluetooth.

Connecting via USB

Connected and charging Blue and Green LED solid when sensor is connected to Graphical Analysis via USB and unit is charging. (Green LED is obscured by the blue one.)
Connected, fully charged Green LED solid when sensor is connected to Graphical Analysis via USB and the unit is fully charged.
Charging via USB,
connected via Bluetooth
Blue LED is solid and green LED is flashing, but the green flashing LED looks white because it is overwhelmed by the blue.

Identifying the Sensor

When two or more sensors are connected, the sensors can be identified by tapping or clicking Identify in Sensor Information.

Using the Product

Connect the sensor following the steps in the Getting Started section of this user manual.

  • Do not put directly into flames.
  • Always wash the probe thoroughly after use.


Calibrating the Sensor

Go Direct Temperature cannot be calibrated by the user. It is custom calibrated before it ships.



–40 to 125°C (–40 to 257°F)

Maximum temperature that the sensor can tolerate without damage






Handle range

–10 to 45°C

Response time (time for 90% change in reading)

10 seconds (in water, with stirring)

USB specification


Wireless specification

Bluetooth 4.2

Maximum wireless range

30 m


18.5 cm tall, 2 cm wide, 11.5 cm shaft length


300 mA Li-Poly

Battery life (single full charge)

~24 hours

Battery life (long term)

~500 full charge cycles (several years depending on usage)

Care and Maintenance

Overheating the sensor is the most common cause for this sensor to break. When used in chemistry labs, students will sometimes lay the sensor on a hot plate and effectively "cook" the unit.

Unfortunately, these causes of breakage are considered misuse and are not covered by our warranty. In our experience, repair is not possible for this type of damage.

The Go Direct Temperature Probe body is constructed from grade 316 stainless steel, which provides a high level of corrosion resistance for use in the science classroom. Here are some general guidelines for usage:

  • The probe handle is constructed of molded plastic. While this material is chemically resistant, we recommend that you avoid submerging the probe beyond the stainless steel part into anything but water.
  • The stainless steel portion of the probe can be left continuously in water at temperatures within the range of –40 to 125°C. Continuous usage in saltwater will cause only minor discoloration of the probe, with no negative effect on performance.
  • You can leave the probe continuously in most organic compounds, such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, n-hexane, lauric acid, paradichlorobenzene, phenyl salicylate, and benzoic acid. The probe should not be left in n-pentane for more than one hour.
  • The probe can be left in strong basic solutions, such as NaOH, for up to 48 hours, with only minor discoloration. We do not recommend usage in basic solutions that are greater than 3 M in concentration.
  • The chart provides the maximum length of time recommended for probe exposure to some common acids. Probes left in an acid longer than these times may bubble and/or discolor, but will still be functional. We do not recommend probes be left to soak in any acid longer than 48 hours.

Maximum acid exposure time

1 M HCl

20 min

2 M HCl

10 min

3 M HCl

5 min

1 M H2SO4

48 hours

2 M H2SO4

20 min

3 M H2SO4

10 min

1 M HNO3

48 hours

2 M HNO3

48 hours

3 M HNO3

48 hours


48 hours


48 hours


48 hours

1 M H3PO4

48 hours

2 M H3PO4

48 hours

3 M H3PO4

48 hours

Battery Information

Go Direct Temperature contains a small lithium-ion battery in the handle. The system is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code: GDX-BAT-300).

Storage and Maintenance

To store Go Direct Temperature for extended periods of time, put the device in sleep mode by holding the button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.

Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.

Water Resistance

The Go Direct Temperature Probe can be submerged in water for limited periods of time. It has been tested to a depth of one meter for up to 30 minutes. However, submerging the sensor impacts the radio operation by absorbing much of the energy. This may make it difficult or impossible to connect to the sensor while submerged, particularly if there are electrically noisy signals nearby, such as pumps or motors.


For troubleshooting and FAQs, see

Repair Information

If you have watched the related product video(s), followed the troubleshooting steps, and are still having trouble with your Go Direct Temperature, contact Vernier Technical Support at or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.


Item Order Code

Micro USB Cable


Go Direct 300 mAh Replacement Battery


USB-C to Micro USB Cable



Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only.


When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.

Battery recycling information is available at

Do not puncture or expose the battery to excessive heat or flame.

The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.

Contact Support

Fill out our online support form or call us toll-free at 1-888-837-6437.

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