Some drivers use sscanf() or sr_atof() to convert their input data (string) to a float/double value. This two functions recognize the decimal mark dependent to the locale settings.

In the case your locale uses "," (comma) as the decimal mark, a string like "1.234" will be converted to 1.0f

This drivers are affected:
dmm/metex14.c: sscanf()
dmm/m2110.c: 2x sscanf()
motech-lps-30x/protocol.c: sr_atod()
In scpi/scpi.c the sr_scpi_get_double() function: sr_atod()

I pushed a fix to https://github.com/knarfS/libsigrok

I was able to test the fix for the metex14 driver and for the scpi function, but couldn't test the m2110 driver and the motech-lps-30x driver.