The X-NUCLEO-53L4A3 is an expansion board for any STM32 Nucleo board equipped with the Arduino R3 connectors. It provides a complete evaluation kit that allows you to learn, evaluate, and develop applications using the VL53L4ED Time-of-Flight high-accuracy proximity sensor with extended temperature capability. The expansion board is delivered with a cover glass holder in which you can fit three different spacers of 0.25, 0.5, and 1 mm height below the cover glass to simulate various air gaps. A small oval cover glass fitting the sensor is included. Several ST expansion boards can be stacked through the Arduino connectors, which allow, for example, the development of VL53L4ED applications with Bluetooth or Wi-Fi interfaces. The evaluation boards shall be tested exclusively under normal temperature conditions. The board is not rated for high temperature operation.