I like this one in its different forms:
Led panel, 100 amp:
http://www.amazon.com/80-260V-BAYITE.../dp/B00YYA01AW
Embedded, TTL serial interface:
PZEM-004T Maximum 100A AC Multifunction Power Monitoring Communications Module Monitor Module Sale - Banggood Mobile
They can both be rigged to a remote device to provide data logging via serial port. Various approaches have been employed to achieve this goal, and there is a wiki page about it. Datasheets, program code, and hardware details are all there.
https://wiki.cuvoodoo.info/doku.php?id=spark_counter
One can get the devices quickly from a domestic source, or slower and cheap from China.
There are oodles of implementations of this stamp by various manufacturers in lots of colors and sizes to fit size or personal taste. Black, white, silver, gray, etc. LED or backlit LCD, low voltage low amp to high voltage high amp. Or, like the above pic, no display at all.