The inclined manometer is a scientific device used to measure very low liquid and gas pressures with high accuracy. It consists of two tubes, one vertical and one inclined, connected to a reservoir. When pressure is applied to the reservoir, filled with a suitable liquid like water or mercury, the liquid rises in the inclined tube. This indicates the pressure level which is easy to read. Inclined manometers are made of acrylic or plastic and can measure pressure ranges from 0-12 mmWC to 0-100 mmWC, making them suitable for low pressure measurement applications requiring precision.