# J-TH

> iPhone/iPad thermo-hygrometer accessory for real-time temperature and humidity. (iPhone/iPad app by Kwan Shing Marco Li.)

- Source: https://appshunter.io/ios/app/j-th/id1148916918 (this page in markdown: same URL + `.md`)
- Developer: [Kwan Shing Marco Li](https://appshunter.io/developer/987891587)
- Category: Utilities, Weather
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 8.0 · 2 MB
- Languages: English
- Released: 2016-11-23
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/j-th/id1148916918/reviews.md

## What is J?

J-TH is a thermo-hygrometer that plugs into audio jack of your iPhone/iPad. 

Features:
-Plug and Play! No setup required
-Temperature range from -30 to 70 degree C (-22 to 158 degree F)
-Humidity range from 0% to 100%
-Real-time Temperature and Humidity measurement
-Comfort Information for reference
-Dew Point and Heat Index calculation
-No battery required

How to use:
1.  Open "J-TH" app.

2. Firmly plug the J-TH into the audio jack of iPhone/iPad and turn the headphone volume to maximum.The temperature and humidity reading shall be shown in a few seconds. 

3. When you finished using J-TH, press "Done", then plug out J-TH from iPhone/iPad.


Troubleshooting:
If the J-TH is not showing the reading, please check the following:
-If the app shows "No J-TH detected" or "No data from J-TH", please manually turn the headphone volume to maximum.
-If the app shows "Cannot access microphone due to privacy setting", then please turn ON the microphone accessibility in privacy setting for "J-TH" app.
-Please make sure "Volume Limit" is turned off in "Settings" of iPhone/iPad.
-For iPhone/iPad purchased in EU, the EU volume limit may apply to devices which means the headphone volume maybe lower, therefore it is not guaranteed that J-TH will work. If there is "EU Volume Limit" in "Settings", please turn it off and try.

Contact us:
If you have any enquiries, please contact
marco@carrin.com.hk

## Key features

- Plug and Play setup
- Real-time temperature and humidity measurement
- Comfort Information display
- Dew Point and Heat Index calculation
- No battery required
- Wide temperature and humidity range


## Frequently asked questions about J

### How do I use J-TH?

Open the J-TH app, firmly plug the J-TH device into your iPhone/iPad's audio jack, and turn the headphone volume to maximum. Readings should appear within seconds. Remember to unplug the device when finished.

### Does J-TH require a battery?

No, J-TH does not require a battery. It draws power directly from your iPhone or iPad through the audio jack connection.

### What is the temperature and humidity range for J-TH?

J-TH can measure temperatures from -30 to 70 degrees Celsius (-22 to 158 degrees Fahrenheit) and humidity levels from 0% to 100%.

### What should I do if J-TH is not detecting the device?

Ensure the headphone volume is at maximum. If the issue persists, check your iPhone/iPad's privacy settings to ensure microphone access is enabled for the J-TH app. Also, verify that 'Volume Limit' is turned off in your device's settings.

### Will J-TH work on iPhones/iPads purchased in the EU?

For devices purchased in the EU, the EU volume limit may affect performance. If you encounter issues, try turning off the 'EU Volume Limit' in your iPhone/iPad's settings and attempt to use J-TH again.

### What information does J-TH provide besides temperature and humidity?

In addition to real-time temperature and humidity, J-TH offers Comfort Information for reference and calculates the Dew Point and Heat Index.

### What devices is J-TH compatible with?

J-TH is designed to work with iPhones and iPods. It connects via the audio jack.

### How often is J-TH updated?

The last update for J-TH was on November 23, 2016, with version 1.6. There have been no updates since then.

## Version history (last 1 release)

### 1.6 — 2016-11-23

This app has been updated by Apple to display the Apple Watch app icon.

## Apps similar to J

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Percentage C](https://appshunter.io/ios/app/percentage-c/id1364829463) | 5.0 (2) | Free | Utilities |
| [Heat Index Calculator - Calc](https://appshunter.io/ios/app/heat-index-calculator-calc/id1522851653) | 4.0 (1) | Free | Utilities |
| [Diagnose Your Crops with AI!](https://appshunter.io/ios/app/diagnose-your-crops-with-ai/id1502937431) | — | Free | Utilities |
| [EasyCozy](https://appshunter.io/ios/app/easycozy/id1561321388) | — | Free | Utilities |
| [Lamborghini Eye](https://appshunter.io/ios/app/lamborghini-eye/id1533404784) | 3.0 (2) | Free | Utilities |
| [RVW Vehicle Tracking](https://appshunter.io/ios/app/rvw-vehicle-tracking/id1500779646) | — | Free | Utilities |

## More apps by Kwan Shing Marco Li

- [J-Thermo](https://appshunter.io/ios/app/j-thermo/id987891588)
- [J-UV](https://appshunter.io/ios/app/j-uv/id1073037537)
- [BLE Thermo-Hygrometer](https://appshunter.io/ios/app/ble-thermo-hygrometer/id1164144654)

All apps by Kwan Shing Marco Li: https://appshunter.io/developer/987891587

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*