Question: Can I calibrate my SensorPush sensor? How?

The short answer is "yes," but we have a video and also a range of tips to help make sure this goes smoothly.

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First you will need an accurate reference for temperature and/or humidity. Each value is calibrated separately and you can choose to calibrate one, both or neither as necessary. Accuracy of the uncalibrated sensor can be found in the full specifications.

Calibration is only intended to correct for small variations (typically up to a few degrees or around 5% relative humidity). If you're seeing a bigger discrepancy than that while calibrating, please contact us, as that would indicate that there's a problem with either the calibration process or your sensor. We'll be happy to help sort it out.

With a Reference Device

If you have a trusted thermometer or hygrometer that you know to be very accurate, you can use it as a reference. Simply place it next to the SensorPush in a stable environment, let them sit for at least 30 minutes to acclimate to each other, be sure you have an updated reading and then use the calibration controls (shown below) to adjust the SensorPush to match the reference. The sensor settings page can be accessed by tapping the button in the top right corner of the graph screen.

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Temperature

If you don't have a reference device, you can still calibrate your sensor. Ice water makes a great temperature reference. Just mix up a bowl of ice water, with a good even mixture of ice and water. Give it a good stir and let it sit while you seal your SensorPush in a zip-top baggie. Get as much air out of the bag as possible. Place the SensorPush (inside the baggie) into the ice water mixture. It's best to leave the zip top out of the water, just in case it doesn't seal entirely.

Give the SensorPush at least 30 minutes to acclimate, be sure you have an updated reading and then adjust the calibration controls so the value reads exactly 32.0°F (0.0°C)

If you have any difficulties, consider these tips:

Humidity

For calibrating humidity, the "salt test" is quite popular, and instructions can be found readily on the Internet. The chemical principle is sound and it can work quite well, but we find it to be difficult to execute consistently and accurately.

Calibrating to an inaccurate reference can be worse than not calibrating at all, so we prefer the Boveda One-Step Hygrometer Calibration Kit, available for less than $10 on Amazon.

Just open the baggie, seal your SensorPush inside and place it at room temperature in a location with minimal temperature variations. Let it sit undisturbed for at least 24-36 hours, be sure you have an updated reading and then adjust the calibration controls to read exactly 75.0% humidity. Keep the calibration kit sealed and you can use it multiple times for at least 3 months after the initial test.

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