You can use `Get-ItemField` function to get all item fields and loop through them as below to read them.

```
$item = Get-Item -Path "master:" -ID "{{Item_ID}}"
$fields = $item | Get-ItemField -ReturnType Field
foreach($field in $fields){
  Write-Host "Field Name: $($field.Name)"
  Write-Host "Field Value: $($item.Fields[$field.Name].Value)" 
}
```

This will return all the fields on the item which are not standard fields. In case you would like to fetch standard fields as well you can add `-IncludeStandardFields` flag to `Get-ItemField` function.

**Note**: In order to make sure `$item.Fields` returns all the fields, you will need to call `$item.Fields.ReadAll()` function before reading item fields as below.

```
$item.Fields.ReadAll()
# exclude standard fields.
$fields = $item.Fields | Where-Object { $_.Name -notlike '__**' }
```

We need to call `ReadAll()` function as above since Fields are lazy loaded, hence the call to this function is required to read all the fields.

Hope this helps!!!