The following tools and equipment are typically required for testing photo sensors with a multimeter: Multimeter: A digital multimeter (DMM) is preferred for its accuracy and ease of use. The humble multimeter, often seen as the cornerstone of any electronics workbench, offers a powerful and relatively simple method for assessing the health and functionality of photo sensors. Instead of relying on complex and expensive diagnostic equipment, a multimeter allows you to measure key. Light-dependent resistors (LDRs), also known as photoresistors, are crucial components in many electronic circuits. Usually, these devices rely on photoresistors, photodiodes, or photomultipliers to detect light and turn it into an electrical signal for measurement. What Does “Accuracy” Mean in a.