Ammonia TEST kits

Whats your favorite test for ammonia? Also do have one you will never use again?
I am getting ready to do a ttm and plan to test frequently. I did pick up a babge, but dont want to rely on that alone.
Thanks for your input
 
I like the Salifert test kit, but the Red Sea Pro is fine also. I would avoid the API test kit, they are highly prone to giving a false positive.
 
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