he or she who scores both a hach and a seneye will be set to give the most updated cycling science in all of reefdom, above anyone.
the dynamics that could be discerned with those two meters benchmarking each other is priceless, to cycle nerds who dream about such a pairing.
you know what I'd love to see on just the hach: one simple true unassisted cycling test.
take a vase or some medium container to keep in your home open topped but topped off. heating doesn't really matter if its inside your home where temps are human tolerant. circulation would help, a common bubbler or if you can't stand the noise then use a dropped in power head.
simply add mixed saltwater up to common specs, some dry rocks we'd use for reefing, fill it up, and let the whole mix stew for 2 months without adding any feed or any bottle bac.
at the end of two months do a full water change for new water
use a volume calculator to input the degree of ammonia it would take to be ~.5 ppm maximum
use the hach measure to verify the nh3 conversion off that input is accurate to the known charts.
if you have a quality pH meter/probe that would help but if you don't, the water change just put you within common pH specs of any reef here.
then retest that setup in 24 hours to see if natural means cycled the mini test tank, which I bet it does on digital meters. all of cycling science will be in an uproar if it passes, and if it doesn't they'll drum me out of town but I'll still post from the road.