The five marker types, how groups organise them, and every operation you can run on a single marker or a whole group.
17 articles
Marker types — at a glance
ZeroCount has five marker types, each with its own job. This is the short version of when to reach for each.
Updated 13 May 2026
Detection markers
Auto-found symbol markers — the type that powers the bulk of a ZeroCount takeoff. Where they come from, how they're grouped, and how they price up.
Unit markers
Manually-placed count markers — one click per item. The simplest marker type, used when auto-detection won't fit.
Linear markers
How to measure lengths on a drawing — cable runs, pipe routes, anything that travels — with scale-aware Linear markers.
Area markers
How to measure floor area, ceiling area, or any polygon region with scale-aware Area markers.
Annotation markers
Free-form visual notes — rectangles, ellipses, arrows, text, custom images, polygons, and polylines. The seven annotation types and when to use each.
Selecting and moving markers
How to select one marker, several markers, or a whole region — and what you can do with them once selected.
Marker groups
The unit of organisation in ZeroCount — what a group is, what's on each row, and how the sidebar tree fits together.
Creating and managing groups
How to rename, delete, and otherwise manage marker groups from the sidebar.
Merging groups
How to combine two marker groups into one — what happens to their markers, links, and labels.
Dragging markers between groups
How to reassign one or more markers to a different group using drag-and-drop.
Group appearance — colour, opacity, and width
Every group has a colour, opacity, and width. Here's how to set them and what each one does.
Group visibility — Cover and Hide
How to temporarily change how a group appears on the canvas without changing what's been counted.
Collapsing the sidebar tree
How to expand or collapse individual groups, whole sections, or the entire marker list, and how the state is saved.
Custom marker icons
How to change the thumbnail image on a Detection group, either by re-imaging from the drawing or uploading a custom image.
The overlap context menu
How to deal with stacked markers on the canvas — selecting one out of a pile that all sit on the same spot.
Undo and redo
How ZeroCount's undo and redo system works, what's in scope, and the keyboard shortcuts.
