11. This soon resulted in the first commercially available pH meter . 12. Imported pH meters tended to be unreliable, possibly because of Japan's hot and humid climate. 13. Rather than buy imported pH meters , Horiba had built his own pH meters for capacitor testing. 14. Rather than buy imported pH meters, Horiba had built his own pH meters for capacitor testing. 15. Before wasting more water, test the soil's moisture level with a Moisture, Light & pH Meter . 16. Before wasting more water, test the soil's moisture level with a Moisture, Light & AMP; pH Meter . 17. However, the most typical auxostats are pH-auxostats, with feedback between the growth rate and a pH meter . 18. Beckman had already developed a successful pH meter for measuring acidity of solutions, his company's breakthrough product. 19. The pH meter is usually calibrated with buffer solutions at known pH values before starting the titration. 20. Here Shockley struck up a friendship with Arnold Orville Beckman, who had invented the pH meter in 1934.
