Interesting. I've used a small meter in my audio room for over 5 years now. Red LED letters, black background. Easily readable in daylight. Also available in green panel mount. I'm not sure Ivan but I may have heard about this one from you ...
muRata DMS020PC-1-LM-F-C
UL Listed, updates itself 2.5 times per second. Very accurate. An instrument not a nightlight. Kinda pricey at ~$65. Buy from Mouser, not A'zon (which has incorrect info.)