lactometer
hydrometer
hygrometer
voltmeter
10 mm below the top of the plates
25 mm below the top of the plates
exactly at the top of the plates
10 to 15 mm above the top of the plates
1.2 V
1.5 V
1.8 V
2.0 V
40%
50%
60%
70%
cylindrical cell and rectangular cell
dry cell and wet cell
primary cell and secondary cell
acid cell and alkali cell
