In many industrial and commercial sectors, environmental humidity and other forms of moisture can have a substantial effect on product quality, security and reliability. The use of moisture and climatic sensors is essential to detect fluctuations in humidity. Precise measurement is required and we recommend models which are both fully calibrated and easy to integrate, with the capacity to accommodate various analogue output signals. Moisture sensors provide the most effective moisture protection for printed circuit boards and those which feature in the Distrelec range have very low drift as a consequence of their wide sensor area.