Totalizer rain gauge
From Glossary of Meteorology
totalizer rain gauge
A nonrecording rain gauge designed to be used at stations that can be visited only infrequently.
The collection can may contain a solution with a low freezing point and a thin layer of oil to prevent evaporation. The amount of precipitation is found after subtracting the amount of solution.
Middleton, W. E. K., and A. F. Spilhaus 1953. Meteorological Instruments. 3d ed., rev., . Univ. of Toronto Press, . 286 pp.