# Depth Gauges

### **What it is**

A depth gauge measures depth **relative to a reference surface**.

### **What it’s used for**

* check pocket depth after machining
* verify hole or counterbore depth
* confirm Z-axis accuracy against CAD/CAM values

***

### **Search terms to buy**

* tire depth gauge (beginner friendly choice)

{% hint style="info" %}
The depth feature on calipers is enough for most jobs. A depth gauge is just more comfortable to handle.
{% endhint %}

{% hint style="info" %}
You can use a **tire depth gauge** for this purpose.\
It’s inexpensive, beginner-friendly, and accurate enough for most setups on a compact CNC. A dedicated depth gauge or depth micrometer is more precise, but not necessary to get started.
{% endhint %}


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