To do this, create a Checkbox or Number field.
If a customer can select one unit of equipment in a single reservation, use the Checkbox field.
Otherwise, use the Number field.
On the field settings form, enter a name.
If necessary, additionally upload a picture.
Set the Limited checkbox and specify Share count.
This is the total number of units of your equipment.
If you use the Number field, you will also see the number of remaining equipment units on the reservation form.
When the number of units runs out, the field becomes unavailable. It disappears from the widget for a specific date.
See the example of the limited Number field in action.