My N90s had the most fantastic light meter of any camera I've ever owned. Reads down to like -1EV. Was on a shoot back in 1995 with that camera, in the middle of Amish country Pennsylvania, 2 o'clock in the morning, moonless night, black as pitch, candle in the window of a farmhouse about a mile away, and that damn camera read the light and I got the shot. Amazing.
Congrats on your F90x.
Best,
-Tim