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slope-level
slope-level n.
Brit. 
/ˈsləʊplɛvl/
, /ˈsləʊplɛvl/U.S. /ˈsloʊpˌlɛv(ə)l/
/ˈsloʊpˌlɛv(ə)l/Π
1828 H. Steuart Planter's Guide (ed. 2) 199 No water can stagnate..where the entire bottom of the space..is worked to a uniform level, that is, a slope-level.
1875 E. H. Knight Amer. Mech. Dict. III. 2214/2 The slope-level or clinometer is used for determining the angle of embankments, the grade of roads, pitch of roof [etc.].
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