This document discusses pressure measurement techniques. It describes various pressure measuring equipment including manometers and mechanical gauges. Specifically, it explains the working of piezometers and simple U-tube manometers. Piezometers measure pressure at a point using a liquid column, while U-tube manometers can measure both positive and negative pressures using two columns of different fluids based on their specific gravities. The document provides examples of using these devices to calculate pressure from measured heights.