These two simple brass microscopes of unknown manufacturer are exactly the same devices, but of different sizes. Its dimensions are: 17 cm. high extended and 14.5 cm. closed. The bottom diameter is 10cm in diameter. The small version is respectively: 8.5, 6.7 and 3.5 cm in diameter its lower part. The apparatus has one eyepiece lens and one lens on the objective that is at the bottom of the optical tube. Focusing is achieved by a wheel that moves the rack etched on the outside of the optical tube.