A new x-ray machine has been installed at Dunedin International Airport, to enhance customs checks.

The biosecurity machine will help ensure international passengers arriving at the airport don't bring pests or diseases into the country.

It has been installed by the Ministry for Primary Industries, and replaces an older model.

The machine will be used to scan baggage from overseas travellers for plant and animal products that pose a biosecurity risk.

It has better image quality and functionality than the older machine.

It's one of 15 new x-ray machines installed throughout the country over the past year.