# Perform a ZO calibration

## Step 1. Navigate to the [Calibration](https://app.onegiantleap.co.nz/calibration) page of the Web Bluetooth app and connect to the power meter

![](https://3210906295-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LAFl-quJvXSIV-V8Y2Z%2F-Miso-OLVvnZSP24ZL6q%2F-Mit2qVG32UvIK9GsFEr%2Fimage.png?alt=media\&token=970864b5-d288-40e5-834b-c19609193d9a)

## Step 2. Perform the Zero Offset Calibration 

* Make sure that the Power Meter is not experiencing any force when you perform the 'ZO' calibration. It's best practice to stand the paddle vertically by leaning it against a wall. This ensures that the shaft is experiencing as little bending as possible. 
* Click on "Zero Offset". The Zero Offsets will update automatically. 

![](https://3210906295-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LAFl-quJvXSIV-V8Y2Z%2F-Miso-OLVvnZSP24ZL6q%2F-Mit39rLg8ylM1T8offI%2Fimage.png?alt=media\&token=a2e20816-997b-434d-8be0-d2e92402282c)