# Probe

## Overview

Probe is a simple client tool that allows to connect and inspect the value of a pv. It can be useful to debug problems as it provides access to protocol dependent information and details of the formula itself.

## Usage

Enter an expression into the "PV Formula" text box and see the output. Names can be entered in various ways:

- Type a PV name, followed by "Return".
- Select a previously entered PV name from the drop-down list attached to the PV name text box.
- Send a PV name to the Probe via the context menu of another CSS application.

## Example

A simple scalar value.