The AMS2 requires the temperature and humidity levels to be within the following range: humidity: 45-65 per cent; temperature: 15-28 degrees. The machine monitors these levels before and during a screening run and warns the user if these are not within specification. If the humidity drops below 45 per cent, the machine may not handle the diamonds being screened as well as it should. This is due to a build-up of electrostatic charge. Humidity can generally be controlled through air-conditioning. If it is not possible to get the humidity levels within limits, an optional integrated humidifier accessory is available and can be purchased through De Beers Group Ignite.