Bausch & Lomb StereoZoom Black 0.7x-3.0x Microscope Head with Double Focus Block

Bausch & Lomb StereoZoom Black 0.7x-3.0x Microscope Head with Double Focus Block Eyepiece tubes measures 23mm in diameter by 40mm deep StereoZoom Head / Pod features 0.7x - 3.0x zoom magnification Objective port measures 37mm in diameter Upper focus block allows 50mm of vertical travel Lower focus block allows 55mm of vertical travel Lower base plate measures 16 x 10 Upper base plate measures 10 x 6 Does not include an objective or eyepieces