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m777182 - you are wrong. While HNO3 is strong (although much weaker than HCl and first step of H2SO4) HNO2 is simply weak acid, with pKa 3.37. General Chemistry Software www.pH-meter.info

These 'devices' are IMHO not worth even these 10 bucks. If it is for gardening, pH stripes with pH range 5-8 will do the best job. If it is for serious agricultural research, pH meter and good electrode are the best choice. General Chemistry Software www.pH-meter.info

Oops, sorry for the mess - no idea how to edit post and/or remove the broken signature :( General Chemistry Software www.pH-meter.info

First of all, check this page, as it contains some information about soil pH measurements. http://www.ph-meter.info/pH-measurements-other-procedures As for the electrode - you may look for example for pHC2051 made by Radiometer. Chemical calculators at www.chembuddy.com www.pH-meter.info

While most of what should be written was already written, let me add one link: http://www.chembuddy.com/?left=balancing-stoichiometry&right=stoichiometric-calculations Browse lectures using menu on the left.