# How to use measurement tool

**URL:** <https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654>\
**Category:** GNU Radio\
**Created:** [March 9, 2014, 5:29am UTC](https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654 "2014-03-09T05:29:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [March 9, 2014, 5:29am UTC](https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654/1 "2014-03-09T05:29:22Z")

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Good morning…

```
            i have a question ..how to use the measurement tool, 

```

which  
are in gnuradio-companion library?. please explain step if possible i  
want  
to use signal probe and average message ^2 block…

–  
_Thanks and regard:_

_MR.Maheshkumar P._

_call @ 9662784649_

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**Author:** ![Maheshkumar\_P](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/f475e1/32.png) [@Maheshkumar\_P](https://www.ruby-forum.com/u/Maheshkumar_P)\
**Post date:** [March 9, 2014, 6:37am UTC](https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654/2 "2014-03-09T06:37:31Z")

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Hi Maheshkumar,

To use the signal probe and the average message block you need to add a  
Function Probe block and a WX GUI Text Box block. For the Probe Signal  
block give it an ID. In Function Probe block - Assign it an ID, block ID  
should be ID of Probe Signal block, and function name should be “level”  
(no  
quotes). In the WX GUI Text Box the default value should be the ID of  
the  
Function Probe block. You should be able to run it now and it’ll display  
values in the text box. Should be the same procedure for Average Message  
block.

AM KC3BBL

On Sat, Mar 8, 2014 at 11:28 PM, Maheshkumar P.