VetPen was developed to make giving insulin injections more convenient, and precision dosing makes it easier to consistently deliver an accurate dose of insulin.
The refillable VetPen automatically measures the prescribed insulin dose and provides an additional option for insulin delivery.
I've been lucky that I never had to inject our dogs with medication, but this certainly sounds much easier to me than messing around with a syringe.
Source article:
FDA Approves First Insulin Automatic Injection Pen for Diabetic Dogs and Cats
Further reading:
Merck Animal Health Receives FDA Approval of VetPen®
Insulin Injection Pen (VetPen): More Questions (and Answers) about this New Diabetic Product