Cartridge
holder
Insulin
scale
Pen
Time passed since last injection (hh:mm:ss)
Number of units last injected
Dose memory
Pen cap
Insulin
window
Dose
memory
Pen ID
Dose
counter
Piston
rod
Piston rod
head
Dose
button
Dose
pointer
Outer
needle
cap
Inner
needle
cap
Needle
Paper
tab
Single-use needle
(example)
Threaded end
(for needle
attachment)
Coloured
band
Piston
Insulin cartridge
(Penfill® cartridge 3 ml)
Glass ball
(in white and
cloudy insulin only)
LOT number
(on reverse side)