Size 14mm diameter tube x 125mm length (235mm) when extended. Focus 20" to infinity. (fits in your pocket like a pen). Use as a MICROSCOPE, PENSCOPE magnifies fine details to 25x. Draw out the chrome finished focusing tube and you have a 10x TELESCOPE to spy distant objects. TELE - MICRO PENSCOPE features high quality OPTICAL GLASS LENS, Stainless steel tube body. Dual purpose TELE - MICRO instrument makes a wonderful gift for all age group.