1?��BRIGHTER AND CLEARER IMAGE: Lens after coating bring high transmittance, high refractive index, the image is brighter and clearer ?2?��CORROSION RESISTANT AND DURABLE: Copper material with fine workmanship, corrosion resistant and not easy to fall, exquisite and durable, the shell is chrome plated with accurate materials ?3?��STANDARD SCREW INTERFACE SIZE: The screw interface size is the international standard RMS size, which can be used by 95% of professional biological microscopes on the market ?4?��4X MAGNIFICATION: This is a 4X high magnification objective, helps a lot in study, work or research, useful and practical ?5?��CORROSION RESISTANT LENS: Achromatic microscope objective bring more comfortable viewing, lenses will not corrode, be dazzled, and have a long service life