How can I tell which kind of smart meter I have installed? A How can I tell which kind of smart meter I have installed? Category: Smart Meters English Every meter has either GIST, GISM or GISS printed on the left hand side of the display. Lorraine Gravino2018-01-22T11:02:43+01:00 FacebookTwitterRedditLinkedInWhatsAppTelegramTumblrPinterestVkXingEmail