Any good set of headphones can reproduce the whole 20Hz to 20kHz human frequency range, and any audio editor software can generate tone sweeps. The frequency response won’t be perfectly flat but it will give a rough idea without paying for properly calibrated testing. Each ear can be checked separately.
As for tinnitus, I don’t know what influences permanence, so the safest assumption would be to avoid any sound exposure that causes it.
Any good set of headphones can reproduce the whole 20Hz to 20kHz human frequency range, and any audio editor software can generate tone sweeps. The frequency response won’t be perfectly flat but it will give a rough idea without paying for properly calibrated testing. Each ear can be checked separately.
As for tinnitus, I don’t know what influences permanence, so the safest assumption would be to avoid any sound exposure that causes it.