I enjoy night shoting but it is very frustrating with my Pentax SM, the reading doesn't lock so I can read the very faint scale even when using the built nite lite.

But my go to meter for night work is my Gossen Luna. Pro SBC. It locks the needle, zero meter style so I can use a headlamp to take my readings off the dial.

BTW if my old memory serves me well, this was rated as one of the most sensitive on the streets.