The best I’ve been able to get is 27Hz. I bought a mooshimeter because the website says it will sample at 8kHz:
https://moosh.im/mooshimeter/specs/
Sampling
8kHz dual simultaneous sampling
4kHz analog bandwidth for most measurements
24-bit resolution max
>18 Effective bits at 125 samples per second
On Board Storage – SD Card
MicroSD Card
Up to 32GB
More than a week of constant logging two channels at 8kHz
Based on this, I thought the resolution may be way lower at 8kHz, but nowhere does it mention that it will downsample to 1/32 of 8kHz. And even if this was made clear, I’d still be unhappy because the real world performance I’m getting is actually 300 times worse than quoted.
The specifications page was last updated in 2015. Reading this forum, it is clear that the sampling limitations have been known for a long time:
It is unacceptable that people are still buying this product based on false marketing claims 18 months later.
James, the very next thing you should do is to update your specs page so that it is no longer misleading.
After that, could you wring any more out of the existing hardware, perhaps by sacrificing other functionality, or measurement resolution. Have you thought about making alternative firmwares or modes available that are optimised for particular tasks? How fast would it be able to sample to SD if it didn’t have to do anything else – you tell it to go dark and record at full speed for x seconds/minutes/hours before coming back online. Users could always hit the reset if they changed their minds and needed to reconnect.