# How a precision click-dial pen works: reading the unit counter window and the click - facts

Canonical page: https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works
Type: Lab article

## TL;DR

How a click-dial pen works: the dial knob, the unit counter window, one click per unit (0.01 ml on the U-100 scale), the end-of-travel stop and dial-back.

## Facts Index

| Fact ID | Category | Entity | Attribute | Value | Source | Evidence |
|---|---|---|---|---|---|---|
| how-a-precision-click-dial-peptide-pen-works:title | identity | How a precision click-dial pen works: reading the unit counter window and the click | title | How a precision click-dial pen works: reading the unit counter window and the click | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:published | identity | How a precision click-dial pen works: reading the unit counter window and the click | published | 2026-07-07 | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:author | identity | How a precision click-dial pen works: reading the unit counter window and the click | author | Preppin' Peppers Editorial Team | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:topics | identity | How a precision click-dial pen works: reading the unit counter window and the click | topics | Evergreen, gansulin, guide, Guides, pen, precision click-dial | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:summary | content | How a precision click-dial pen works: reading the unit counter window and the click | summary | How a click-dial pen works: the dial knob, the unit counter window, one click per unit (0.01 ml on the U-100 scale), the end-of-travel stop and dial-back. | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-1 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | What it is | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-2 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | The dial knob and window | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-3 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | The click you can hear and feel | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-4 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | The end-of-travel stop | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-5 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | Dialing back without waste | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-6 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | Why metal, and why reusable | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:section-8 | content | How a precision click-dial pen works: reading the unit counter window and the click | section | What the research community gets wrong about precision click-dial pens | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works |
| how-a-precision-click-dial-peptide-pen-works:product-gansulin-metal-peptide-pen | products | How a precision click-dial pen works: reading the unit counter window and the click | references product | Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/products/gansulin-metal-peptide-pen |
| how-a-precision-click-dial-peptide-pen-works:product-portable-pen-carry-case-reusable-fits-3-ml-cartridge-pens | products | How a precision click-dial pen works: reading the unit counter window and the click | references product | Portable Pen Carry Case (Reusable, Fits 3 ml Cartridge Pens) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.preppinpeppers.com/products/portable-pen-carry-case-reusable-fits-3-ml-cartridge-pens |
| how-a-precision-click-dial-peptide-pen-works:source-pmc-ncbi-nlm-nih-gov | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | Sparre et al., J Diabetes Sci Technol 2023: Factors Affecting Performance of Insulin Pen Injector Technology: A Narrative Review - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://pmc.ncbi.nlm.nih.gov/articles/PMC10012375/ |
| how-a-precision-click-dial-peptide-pen-works:source-pmc-ncbi-nlm-nih-gov-2 | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | Abdel-Tawab et al., J Diabetes Sci Technol 2015: Dosing Accuracy of Two Disposable Insulin Pens According to New ISO 11608-1: 2012 Requirements - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://pmc.ncbi.nlm.nih.gov/articles/PMC4738205/ |
| how-a-precision-click-dial-peptide-pen-works:source-www-zwickroell-com | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | ISO 11608-1/-3: Testing pen injectors and insulin pens (dose accuracy, actuation and glide force) - ZwickRoell technical guidance - www.zwickroell.com | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://www.zwickroell.com/industries/medicalpharmaceutical/therapy-systems/insulin-pens-and-pen-injectors-iso-11608-1-3/ |
| how-a-precision-click-dial-peptide-pen-works:source-pubmed-ncbi-nlm-nih-gov | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | Bohannon, Postgrad Med 1999: Insulin delivery using pen devices. Simple-to-use tools may help young and old alike - pubmed.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://pubmed.ncbi.nlm.nih.gov/10560468/ |
| how-a-precision-click-dial-peptide-pen-works:source-pmc-ncbi-nlm-nih-gov-3 | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | Jonker et al., Int J Clin Pharmacol Ther 2021: First pre-filled pen device with highly purified human menopausal gonadotropin (HP-hMG, Menopur) in liquid is shown to be bioequivalent to powder for reconstitution - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://pmc.ncbi.nlm.nih.gov/articles/PMC8594316/ |
| how-a-precision-click-dial-peptide-pen-works:source-pmc-ncbi-nlm-nih-gov-4 | source | How a precision click-dial pen works: reading the unit counter window and the click | cites | Lingen et al., Endocr Connect 2023: Advantages and disadvantages of connected insulin pens in diabetes management - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/how-a-precision-click-dial-peptide-pen-works) | https://pmc.ncbi.nlm.nih.gov/articles/PMC10563601/ |

## FAQ

### How does the click mechanism work on a precision click-dial pen?

A spring-loaded pin engages successive grooves in the mechanism—one groove per unit—producing a firm tactile bump and audible click each time one unit is added or removed, letting you count by touch without viewing the window.

### What does one unit equal in milliliters on a U-100 pen?

On the standard U-100 scale, one unit equals 0.01 ml, so 10 units equals 0.10 ml. The unit counter window on pens like the Gansulin all-metal pen displays settings from 1 to 60 units.

### How do you correct an over-dialed setting on a reusable pen without wasting liquid?

Simply turn the dial knob back down. On a well-made pen, dialing down does not expel liquid from the cartridge, so no volume is lost during the correction. The Gansulin pen dials back to a 1-unit minimum.

---
Built from PreppinPeppers store data and verified sources only. Same content for every visitor. Research and educational use only, not for human or veterinary use.