| Hi Kiki.
The Ammonia and Nitrite are electronic with digital display.
You still have to mix chemicals but instead of making a haphazard comparison against a chart this does it for you.
You basically put a test tube of pond water into the meter and zero in the meter. Takes a few seconds. Then mix a chemical with another test tube of pond water and place it the meter for a reading. The meter times the reading and gives a digital output.
One takes 10minutes the other less. I set up the ammonia (10mins) first and then the Nitrite (6mins) with a bit of experience you can get them both to read out at roughly the same time.
Once its done you wash out the test tubes and put it away. Probably 15 minutes all told and a far higher degree of accuracy than any colour comparison chart.
rgds BERN
__________________ South East Section BKKS
and www.koipin.com |