Bluetooth Low Energy

I have tried using the extension of BluetoothLE(Bluetooth Low Energy) 

with a pulse oximeter device and a blood pressure but the read data were is not visible.I want to ask, if in addition to the connection withArduino who has no problems,
some of you managed to read the data with other tools (such as heart rate monitor wrist or other...)

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There are quite a few examples of people who were successful using BLE.
Maybe you can post your blocks and tell what the API of the oximeter etc. is, such as UUID's and so on.

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I purchased  this oximeter:

http://www.medisana.com/en/Health-control/Pulsoximeter/PM-150-connect-Pulseoximeter.html

the blocks for the app i got them from this discussion:

AI2: Bluetooth (BLE): support and documentation

The oximeter is coupled to the smartphone

but there are no data read.

Someone managed with other pulse oximeters models

to read the data?

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This has not much to do with oximeters possibly, but with your use of the API it provides,
You should study their docs. For example I found this: https://github.com/Medisana/vitadock-api/wiki/Bluetooth-Access-of-the-Devices
And some other Github stuff. It seems that they have an app that collects the data and that you can process these data from there, for which you may need an access token and for which you need to write a very different type of app. It seems though that direct access to the devices is possible, but that they will not provide support.

This is totally beyond my expertise and has not much to do with APP Inventor.
Anyway, you did not tell why you did not receive any data and what you tried. Show some blocks!

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