Product Review

C-mount Lens:
Working distance: 100-115mm
zoom c-mount Lens
1.0X C-mount adapter
zoom ratios: 6.5:1
Objective Magnification Power by 0.7 - 4.5X(about 10 - 300X on the 21 inch display)
Size: 24.5mm(L) * 50mm(DIA)
Weight: 630g

Package Including:
1 x 300X Zoom C-mount Lens

recommend for you
add a Barlow lens then you can get a new lens with more/less magnification
1:0.3X Barlow lens: https://www.amazon.com/dp/B07K6DLDGG
2: 0.5X Barlow lens: https://www.amazon.com/dp/B071G2DSQY
3: 2X Barlow lens: https://www.amazon.com/dp/B0711M8FK2