Water Test kit....is that true?

For many years into this hobby I never used anything to test my water parameter (I guess I'm lazy) but I didn't encounter any issues for my fishes at all.
Today all of sudden I picked up water test kit and curious about my fish tank water. I did all the tests Ammonia, Nitrite, Nitrate and turn out everything a 0 ppm.
Is that possible to have everything at 0 ppm? lol (I researched my PH local tap water and the PH test result almost locked right at the number I got from my local water supply). I know it's nice to see everything under control but I doubt these test kits giving out accurate test results.
Tank and fish spec:
*125G using 2x Fluval G6 filter system, heavy planted tank, 13 watts UV, and around 120 Exodons (tank is 3 months old).

hmmm I did the Nitrate test again and color chart still show at 0 ppm LOL
Might be too small amount that the test kit doesn't give out accurate color result?

*Using API freshwater master test kit.

Thanks all for the tips, I did my tests wrong
My Nitrate now read 5 ppm, Ammonia 0.25 and Nitrite still at 0 ppm.

I'm normally do 10% water change every 3 days instead do a large water change every week or every 2 weeks, with these tests kit i'll monitor my water parameter closely and do water change when needed I think I'm getting old to do every 3 days water change hahahaha