Adobo, your API test kits are fine for testing during cycling. It's more important to be able to see/detect changes in tank parameters rather than determining the exact numbers at any time. The API kits are perfectly fine for detecting changes, just don't put all your faith in any one exact reading beng perfectly spot on all the time.
When the ammonia test shows dark green one day and then light green and then yellow the next, you know ammonia went down... That's good enough for cycling. Monitor changes in ammonia and nitrite.
Your tank will be cycled when the bacterial filter can process 2ppm ammonia down to 0ppm in 24 hours. Telling that is easier if you can dose your tank quickly and easily with ammonia chloride.
When the ammonia test shows dark green one day and then light green and then yellow the next, you know ammonia went down... That's good enough for cycling. Monitor changes in ammonia and nitrite.
Your tank will be cycled when the bacterial filter can process 2ppm ammonia down to 0ppm in 24 hours. Telling that is easier if you can dose your tank quickly and easily with ammonia chloride.