hagen nitrate and nitrite test kits?

Hi

I have a hagen nitrate test kit with three reagents.

I also had the nitrite test kit with 2 reagents.

When using these tests the first two reagents in each test kit seemed to
be the same to me.

Is this so?

If it is then obviously there is no need to buy both kits.

I seem to have lost the instructions with colour chart for the NO3 test
kit. I have googled the web abd groups and been to Hagens website but I
could not find an online manual and colour chart.

If any one knows where one is available I would be most gratefull or at
least just tell me how many drops of each reagent!!!!! Thanks in advance

Trev