Lens User Guide
Learn how to balloon your engineering drawings, apply tolerances, and generate inspection sheets.
Upload your first drawing
Get balloons on your drawing in under a minute.
Export an inspection sheet
Download your ballooned drawing as a PDF or inspection sheet.
Apply tolerances
Scan tolerances from your drawing or use a standard.
Browse all topics
Getting Started
Log in, upload a drawing, see your first balloons
The Workspace
Understand what's on screen
Working with Dimensions
View, edit, add, and verify dimensions
Working with Views
Manage detected views and reorder balloons
Working with Notes
Add and edit notes on your drawing
Critical Parameters
Mark dimensions as Major, Minor, or Critical
Applying Tolerances
Scan, select, or create tolerance rules
Title Block & Drawing Details
Edit part name, revision, material, and more
Reference Grid
Add a grid overlay to locate dimensions
Redacting Sensitive Information
Hide confidential areas before sharing
Customizing Balloons
Change balloon colors and sizes
Exporting
Download PDFs and inspection sheets