added function to find desired scale

test/runtests.jl

@@ -9,7 +9,7 @@ using LinearAlgebra
 
 function _check_volume(triangles; scale=1)
     """
-    Slow algorithm just used to test the other algorithms
+    Slow, inaccurate  algorithm just used to test the other algorithms
     Reference:
         https://people.eecs.berkeley.edu/~wkahan/VtetLang.pdf
     """
@@ -75,4 +75,7 @@ end
             @test props.volume ≈ volume rtol = 0.01
         end
     end
+    @testset "Find Scale" begin
+        @test fast_volume(stl; scale=find_scale(stl)) == 1.0
+    end
 end