The TLM 103 D lists

"Free-field sensitivity (1 kHz): –39 dBFS"

But what is dBFS? dB relative to a full-scale sine wave or a full-scale square wave? (3 dB difference)

This is the digital level when the acoustic level is 94 dB SPL?

The mic has a built-in gain of 0...63 dB. This measurement is only at 0 dB gain? "All data with respekt to 0 dB pre-attenuation and 0 dB gain."