I had to ask for it. I spoke to my GPs after I was diagnosed and asked for a NovoRapid Echo pen. I got asked why, and had to explain about the half-unit increments. It came two days later to the pharmacy to collect with the test strips, Lantus, NovoRapid cartridges, etc.Hi John. Thanks for posting about your 0.5u refillable cartridge NovaPen Echo. Having a pen which uses 0.5u will be very helpful for matching insulin with carbs more accurately