Potentiograph, E336A made by Metrohm AG, Herisau, Switzerland, 1961-1970. Includes dust cover. Potentiograph, E336A made by Metrohm AG 1961-1970
2 German mechanical burettes mounted on wooden stands - marked "Metrohm A.G Herisau No E274" Buhler 6691 2 German mechanical burettes