Calculated Industries 3339 is a user-friendly measuring tool that combines ultrasonic distance measurement with laser pointer capabilities. With a range of 20 inches to 50 feet, this device is suitable for a variety of measurement tasks, both indoors and outdoors. The large LCD display clearly shows the measured distance, and the backlit display makes it easy to read even in low-light conditions. The laser pointer helps you accurately target your measurements, and the front/back measurement mode allows you to measure from either the front or back of the device.