> For the complete documentation index, see [llms.txt](https://docs.voltera.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltera.io/docs/nova/learn-nova/plan-workflow/5.5-probe-targets.md).
# 5.5 Probe Targets
Probing is a critical step for achieving a successful multilayer print. Since you're printing over multiple layers of ink, it's essential to create an accurate height map of the surface.
You can generate probe targets by selecting a layer, setting your probe pitch value, Edge Probe Factor, and clicking the Generate Probe Targets button.
{% hint style="info" %}
We recommend using one probe pitch value for an entire artwork layer. We don't recommend generating probe targets with different settings at a per polygon level.
{% endhint %}
### Probe Pitch
The probe pitch set's the maximum distance between probing measurements. This means that a smaller probe pitch creates a more accurate map, but takes longer to complete. This setting works the same way for multi-layer printing as regular prints. The Edge Probing Factor is how we accommodate multi-layer printing.
### Edge Probing Factor
The edge probing factor is used to to provide denser probing around the layer transition edges. The layer transition edge probe pitch equals to normal probe pitch times edge probing factor.
eg. If probe pitch is set to 5mm, edge probing factor is 0.33, then transition edge probe pitch is 5\*0.33 = 1.65mm
{% hint style="info" %}
The minimum setting for this value is 0.01 and the maximum setting for this value 1.0
{% endhint %}
### Custom Probe Targets
With plan you can now customize the location of your probing targets by adding or deleting targets.
* You can add probe targets by pressing the **alt** key and clicking on your design.
* You can delete probe targets by selecting a target and clicking the **delete** key. You can select multiple targets at a time by holding down the **ctrl** key.
{% hint style="info" %}
You cannot add a probe target over a toolpath when it is visible. When adding probe targets it is easiest to hide all toolpaths using the display menu.
{% endhint %}
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