Short answer: the weather. Longer answer: The altitude sensor in the GDX-ACC device is an air pressure sensor with a wide range (-1800 m to 10,000 m) and about a 1% tolerance in accuracy (for absolute measurements, approx. 120 m from any given actu...

The Mean Squared Error (MSE) is a measure of how close a fitted line is to data points. For every data point, you take the distance vertically from the point to the corresponding y value on the curve fit (the error), and square the value. Then you ad...

This information pertains to LabQuest 2. If you have a LabQuest 3, see this article. If you have an original LabQuest, see this article. To verify that a LabQuest 2 is charging, connect the unit to AC power, turn the unit on and look at the icon i...

Both Logger Pro and Logger Lite are no longer updated. We recommend using Vernier Graphical Analysis app instead. Logger Lite was data-collection software designed for use in K-8. It worked for basic data collection. If you are doing more complex...

No. It is not possible to do a two-point calibration with Go Direct® Optical Dissolved Oxygen Probe (GDX-ODO). The probe is factory calibrated and does not need to be calibrated by the user....

Yes. If you have an older edition of a Vernier lab book that only has procedures using the Dissolved Oxygen Probe (DO-BTA), you can access the most up-to-date version of the lab book through your online account. From there you can download the update...

Testing testing All optical dissolved oxygen probes work on the same principle and all must have the sensing cap containing the luminophore replaced periodically due to a event known as photo-bleaching. If your Optical DO sensor is reading zero, ...

If the LabQuest App doesn't detect a sensor when the sensor is plugged into the LabQuest this could be caused by the sensor or the LabQuest. Keep in mind that some sensors never had the auto-detection functionality in the first place (including every...

Note: Do not use a Hard Reset except as a last resort such as when both the screen and hard keys are not responding. This is equivalent to turning off a computer by pulling out the power cord instead of shutting it down. For other options, see How d...

This information pertains to the original LabQuest. If you have LabQuest 2, see this article. If you have a LabQuest 3, see this article. There are several ways to reset LabQuest. Try these steps in the order listed below. Reboot: For a low-...