or
Invitrogen EVOS 20X Objective, achromat, LWD, phase-contrast, 0.40NA/6.92WD, For Use With: EVOS M5000, EVOS M7000, EVOS FL Imaging System, EVOS XL Core Imaging System, EVOS FL Color Imaging System, EVOS FL Auto Imaging System, EVOS XL Imaging System, Lens