Please find detailed instructions on how to connect and measure with the N-Tester BT here.

When you prepare the N-Tester measurement in the Atfarm mobile app, you'll be asked to turn on your N-Tester BT and enable Bluetooth® wireless technology on your mobile device so that the Atfarm mobile app can pair with the N-Tester BT to receive the readings and calculate a recommendation from them. The pairing is indicated by a flashing blue LED on the N-Tester BT. If the pairing was successful, you'll receive a signal from the app and the blue LED will stay on.

If you can't pair your N-Tester BT with the Atfarm mobile app, it may be for one of the following reasons:

Mobile device displays Bluetooth® connection options

If your mobile device displays Bluetooth® wireless technology connection options after enabling the Bluetooth® wireless technology, then you may be trying to connect the N-Tester BT directly in the Bluetooth® wireless technology settings of your mobile device.

Please don't connect the N-Tester BT in these settings, as you may be used to from other devices. The N-Tester BT is paired directly with the Atfarm mobile app. The Atfarm mobile app will ask you to enable Bluetooth® wireless technology and will automatically establish a temporary connection in the background.

If the provided solution didn't solve the problem, please contact our support team and let us know the Android/iOS software version of your mobile device, the N-Tester BT serial number, and describe the problem and the steps you took to solve it.

Mobile device asks for PIN

If your mobile device asks for a PIN after enabling the Bluetooth® wireless technology, then you may be trying to connect the N-Tester BT directly in the Bluetooth® wireless technology settings of your mobile device.

Please don't connect the N-Tester BT in these settings, as you may be used to from other devices. The N-Tester BT is paired directly with the Atfarm mobile app. The Atfarm mobile app will ask you to enable Bluetooth® wireless technology and will automatically establish a temporary connection in the background.

If the provided solution didn't solve the problem, please contact our support team and let us know the Android/iOS software version of your mobile device, the N-Tester BT serial number, and describe the problem and the steps you took to solve it.

Device search time too long/blue LED flashes continuously

If the device search takes a long time and the blue LED keeps flashing when you try to connect the N-Tester BT to the Atfarm mobile app, please try these solutions in order:

1. In the Atfarm mobile app, go back to where you entered your field data and start the device search again.
2. Turn off your mobile device's Bluetooth® wireless technology and turn it back on.
3. Restart your mobile device.
4. Uninstall the Atfarm mobile app and install it again.

If the pairing was successful, you'll receive a signal from the app and the blue LED will stay on.

If the provided solution didn't solve the problem, please contact our support team and let us know the Android/iOS software version of your mobile device, the N-Tester BT serial number, and describe the problem and the steps you took to solve it.

Device does not turn on/LED flashes red

If the N-Tester BT doesn't turn on when you press the On/Off button, or if it turns off during use, the batteries may be inserted incorrectly or may be empty. A red flashing LED during initialization will indicate this.

Please try the following:

1. Open the battery compartment of the N-Tester BT by removing the four screws with a PH1 screwdriver.

2. Check that the batteries are inserted correctly. Bend the battery contacts slightly toward the batteries.

3. If the last step didn't work, replace the batteries.
   • The N-Tester BT uses 2x AA (LR06) alkaline batteries (non-rechargeable).
   • Empty batteries must be removed and disposed of at a collection point. Batteries should never be disposed of with household waste.

4. Close the battery cover.

5. Restart the measurement in the Atfarm mobile app.

6. Press the On/Off button to start the device. Don't turn on the device until prompted by the app. This is after you've entered the field data in the connection step.

If the provided solution didn't solve the problem, please contact our support team and let us know the Android/iOS software version of your mobile device, the N-Tester BT serial number, and describe the problem and the steps you took to solve it.

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Yara International ASA is under license. Other trademarks and trade names are those of their respective owners.