I have the Raytech big gun with the cone....my friend has the exergen.......
the odonnell,on RB,OS,Nova,and and my HPI purple head nova is always within one degree of the EXERGEN and RAYTECH...small,BACKLIT, 39.95...
a GREAT temp tool..
http://www2.towerhobbies.com/cgi-bin...&P=SM&I=LXLXW8
PS....the raytech stays home....