# How to calibrate temperature/hydrometer **URL:** \ **Category:** Uncategorized\ **Created:** [May 21, 2022, 11:37am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553 "2022-05-21T11:37:03Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Robdan](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/robdan/32/191_2.png) [@Robdan](https://community.inkbird.com/u/Robdan)\ **Post date:** [May 21, 2022, 11:37am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/1 "2022-05-21T11:37:03Z")
How do I calibrate the thermometer and hygrometer so I can check to see if the Inkbird is accurate?, and how do I save these calibrated values when I enter the values into the 0.00 slot. Thanks. ![image](https://canada1.discourse-cdn.com/flex031/uploads/inkbird1/original/1X/924a9c73a4e0a7716eb610f4efdb83846c313b2e.jpeg) ---
**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\ **Post date:** [May 23, 2022, 1:13am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/2 "2022-05-23T01:13:23Z")
The INKBIRD sensor is factory calibrated. It can also be compared with other accurate thermometers/ hygrometers. If there are deviations, it can be calibrated via the Engbird app. For example, if the sensor is 2 degrees lower than the actual reading, please enter 2 in the temperature calibration settings, then please click on the blank position on the current page and it will automatically save the settings. The same applies to humidity calibration settings. ---
**Author:** ![Robdan](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/robdan/32/191_2.png) [@Robdan](https://community.inkbird.com/u/Robdan)\ **Post date:** [May 23, 2022, 1:49am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/3 "2022-05-23T01:49:49Z")
Thanks. I think I have this worked out. ---
**Author:** ![Row](https://avatars.discourse-cdn.com/v4/letter/r/7c8e57/32.png) [@Row](https://community.inkbird.com/u/Row)\ **Post date:** [July 12, 2022, 12:18pm UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/4 "2022-07-12T12:18:25Z")
How do I set a negative temperature correction value? There seems to be no way to enter the minus sign. If I try a very high value, it tell me the permitted range is -50 to +50, but I can’t find out how to enter a negative value. ---
**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\ **Post date:** [July 13, 2022, 1:48am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/5 "2022-07-13T01:48:59Z")
Hello, Please click on the input box and enter the negative calibration value manually. It is possible to enter the minus sign. When finished, please click the blank position near the input box and it will save the setting. If it still has problem, please provide the sensor model, phone model and a video of the problem to [support@inkbird.com](mailto:support@inkbird.com). These will help us to determine the problem. Thanks. ---
**Author:** ![User\_1704226016493](https://avatars.discourse-cdn.com/v4/letter/u/7bcc69/32.png) [@User\_1704226016493](https://community.inkbird.com/u/User_1704226016493)\ **Post date:** [June 14, 2024, 9:19pm UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/6 "2024-06-14T21:19:16Z")
I have 2 different IBS-TH5 devices. They both have VERY DIFFERENT readings for humidity. Like 7.5% difference. Do they need to be calibrated? ---
**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\ **Post date:** [June 17, 2024, 7:08am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/7 "2024-06-17T07:08:23Z")
Hello, Maybe you could do a salt test and calibrate them? Even if the models are different, it works the same way: > [@Q: The measured result of ITH-20 is inaccurate, different from the reading of other hygrometers](https://community.inkbird.com/t/q-the-measured-result-of-ith-20-is-inaccurate-different-from-the-reading-of-other-hygrometers/87): > > A: Can you test it with the salt method? To test your hygrometer using salt, you just need a few household supplies: A small food storage bag that zips A tiny cup or bottle cap from a 20-ounce soda Some table salt Water Put salt on the lid and add an appropriate amount of water to make a thick slurry. You don’t need to add too much water, just let the salt become wet. In case you accidentally add too much, you can use a paper towel to absorb the excess water. Put the cap and the hygr… If the readings are off, it can be adjusted with the calibration settings. ---
**Author:** ![Barry1](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@Barry1](https://community.inkbird.com/u/Barry1)\ **Post date:** [June 26, 2024, 11:32am UTC](https://community.inkbird.com/t/how-to-calibrate-temperature-hydrometer/553/8 "2024-06-26T11:32:11Z")
I’m assuming that when you say the devices have different readings, that they beside each other. I have 2 about a foot apart in a large humidor with different readings on the different shelves. Considered I tried the salt method which showed them both off by different amounts. Something about this didn’t seem right so I purchased a Boveda calibration kit and both were accurate.