Abstract: The present invention is a device to measure wind velocity and/or direction. These measurements may be useful for various outdoor activities including hunting, golfing, sailing, fishing, photography, kite-flying, parachuting, fireworks displays or other activities that are influenced by wind conditions. In broader context, sensitive detection of pressure (force) is important in everything from aeronautics to the design of biological sensors. In general, the majority of existing devices to measure wind depend on wind's interaction with a relatively large mass, thus limiting sensitivity. Although various types of sensors including optical strain gauges with the desired sensitivity exist, they are too large, complex or expensive to be broadly exploited. The present invention provides a relatively simple, inexpensive and sensitive pressure sensor (optical strain gauge) for incorporation in a wind-measuring device.