By sealed I mean one that the battery cell is not readily replaceable and they do not have a big spring contactor, just like a cheap flashlight that is always corroding and becoming intermitant and do not have a split aluminum case with case threads that the ground circuit must traverse that also corrodes and/or gets oily. Heck I have even seen folks oil those threads on those things because they tend to thread together poorly. That is just like switching the light switch off! Unfortuanately there are a lot of those around. Any I acquire these days through a buyout I discard and won,t even give them away.

Another replaceable type that is a problem is the popular purple aluminum case double A sized one that is intended to use with alkalines. They frequently are sold for ten bucks and look to be very well made. The problem comes when after the first outing and use if you forget to remove the cell when you get home it will be dead for sure on the next outing and that gets to be a real pain in lost time and money.

My favorite and the ignitor I use the most and always keep on hand in both the long and the short is this one and I have found it to be at top of the reliabilty list bar none and I also avoid the metered types completely. Most of the meters will fail after just one drop to asphalt even though the ignitor will still work. The meters only real use is just a continuity meter anyway.

http://www3.towerhobbies.com/cgi-bin...&I=LXME72&P=RF


Just one mans opinion

John