http://cgi.ebay.com/Mini-Green-LED-D...QQcmdZViewItem
There is one. If you look in his store you'll find various others including ones that are more accurate (like .01 or even .001 volts) as well as ones which measure as high as 500v. There are also ones of different color. (I think that one is green, there is red and blue as well).
BL Revo: CF G2R, LMT1940/7, 6S FP 30C Lipos, MMM, Hitec 5955TG
CRT .5: 7075 Ext Chassis, LMT1930/7, FP 25C 3S Lipos, MM