The Latest Advanced Instrument Sceens from Casella are designed to be a direct replacement for the traditional wooden screens that have been supplyied for many years. They can be installed on the current support frames. Traditional housings are made of wood and painted, absorb water when old, affecting temperature and humidity measurements, and they require frequent maintenance. The advantage of the new screens is that they are manufactured from UV optimised plastic which requires no maintenance and does not interfere with the measurement equipment. This offers the user considerably extended life of the units in the field. Extensively tested and approved for use by the UK Met Office, the new screens set a new standard in manual meteorlogical measurement techniques.