It is digital item for download. The product is NOT physical.Due to the low measurement accuracy, the product is more suitable as a gift and educational purposes. For your father, son, specialist, Dad, curious girl.The rangefinder contains three parts:-Measuring plate with rectangular hole (window);-Slider;-Cord (sisal, twine).You have to add your own cord with length of 25 Inches.Also, for accurate measurement, the plate dimensions of 1.25 by 3 inches must be observed.You can make the plate and