How long do the test kits last?

Some reagents last a long time and some only last a year or two. The reagents from tftestkits are now garanteed for 18 months so that tells you how long they expect them to last.

Now if you're asking how long before you run out of them. That's a different issue. Most people get a couple years out of most of them.
 
The TF100 is the only one with the 18 month warranty. It also is put together by the forum site owner (Dave) and includes more of the reagents that are typically needed. The K-2006 uses the same chemicals, but you do not get enough of some of the reagents and will quickly run out ... especially if you have to go through the shock process.

Both will do the same thing, but the TF100 really is the best value.
 
I of course recommend the TF-100. It has the most of the reagents you normally use and will last a good long time. It seems expensive but it's a better buy then any of the others, and you'll start off with a nice kit. I suggest you order the Speedstir with it too. It's completely optional but if you do get one you'll wonder how you went so long without one.
 
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