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300ft distance remote display voltmeter?
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Postal2:

--- Quote from: mikeselectricstuff on August 09, 2024, 09:19:03 pm ---.... You'd certainly need class 1 modules at each end,  directional antennas wouldn't hurt

--- End quote ---
In modern urban conditions (in 2024, not 2008), you won't be able to communicate via Bluetooth further than 10 meters (using reasonably sized antennas). But deep in the forest or in a straight mountain tunnel, your idea will definitely work if you can attach a bluetooth module to a multimeter.
Zoli:

--- Quote from: Postal2 on August 09, 2024, 10:27:00 pm ---
--- Quote from: mikeselectricstuff on August 09, 2024, 09:19:03 pm ---.... You'd certainly need class 1 modules at each end,  directional antennas wouldn't hurt

--- End quote ---
In modern urban conditions (in 2024, not 2008), you won't be able to communicate via Bluetooth further than 10 meters (using reasonably sized antennas). But deep in the forest or in a straight mountain tunnel, your idea will definitely work if you can attach a bluetooth module to a multimeter.

--- End quote ---
Last time I tested was in 2020; handheld: Juniper FieldPC2(in hand); serial module 1.5m above ground; antenna(separate, but included with the module) on a 10X10X0.15cm Al plate. Setup was along a street in an industrial area. The ESD-100 module was obsoleted with version 1.1.4 in 2021, IIRC.
Postal2:

--- Quote from: Zoli on August 09, 2024, 11:54:31 pm ---... Juniper FieldPC ...

--- End quote ---
Thank you, your experience is interesting. My task for bluetooth was more trivial, I just wanted to listen to the speaker in the places where I work. At this moment I see 21 wi-fi access points at 2.4 GHz and the bluetooth modules (5 pcs) and antennas (3 pcs) I tested gave a difference of 1 meter with an average distance of 7 meters. I also noticed that the size and complexity of the antenna does not matter at all, since it increases the interference on reception to the same extent.

In the end, I settled on the QCC3056 transmitter (stated range is 25 meters).
Zoli:

--- Quote from: Postal2 on August 10, 2024, 12:52:15 am ---...
My task for bluetooth was more trivial, I just wanted to listen to the speaker in the places where I work.
...

--- End quote ---
It is quite a bandwidth difference between the serial transmission@9600bauds in my setup and audio transmission; IMO, that's the cause of failure. My setup worked with other handhelds too( HP h5550, hx2495, Pidion BIP-6000), providing the same range; no need for export controlled items(yep, FieldPC2 cannot be legally exported to Iran)  :-DD :-DD :-DD
Postal2:

--- Quote from: Zoli on August 10, 2024, 07:04:01 am ---.... It is quite a bandwidth difference between the serial transmission@9600bauds in my setup and audio transmission; IMO, that's the cause of failure. ....

--- End quote ---
The idea is interesting. But I use a video transmitter 5Ghz to get the necessary distances where bluetooth does not work.
https://aliexpress.com/item/1005006199175943.html
In general I recommend LoRa, but in this particular case (which can be resolved with one transistor by schoolboy) it is not required.
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