Powerful pocket-sized electronics.
Every meter is simple to use and cost effective.
Only few years ago, the measurement of pH, conductivity and relative humidity could be performed by complicated apparatus and trained laboratory technicians. The two methods of measuring these parameters were on opposite ends of the spectrum. At one end, you had the traditional pH litmus paper and kits with low resolution. The other method required training and complicated equipment to perform the analysis. The latter method had extremely high resolution, but could not be performed by everyone.