Iron Test Kits

Can anyone give me the name and sorce of a good iron test
kit. I like Lamotte Kits but I buy my kits from Pet Warehouse
and they don't sell a Lamotte Iron test kit.  They sell a
Seachem Iron Test kit - It is miserable to use.  The color scale 
is very very difficult to read. The reagent hardens up from 
the humidity in our Ohio air and is next to impossible to 
use.  What a WASTE of $16.  I have heard Lamotte makes an 
Iron test kit but I don't know where to get it.
Thanks ahead of time!
Paul in Ohio       Go Indians