diff --git a/src/scgenerator/physics/units.py b/src/scgenerator/physics/units.py
index ffe37c0..19ddb61 100644
--- a/src/scgenerator/physics/units.py
+++ b/src/scgenerator/physics/units.py
@@ -386,6 +386,9 @@ class PlotRange(tuple):
     def sort_axis(self, axis: np.ndarray) -> tuple[np.ndarray, np.ndarray, tuple[float, float]]:
         return sort_axis(axis, self)
 
+    def __reduce__(self):
+        return (PlotRange, (self.left, self.right, self.unit))
+
 
 def sort_axis(
     axis: np.ndarray, plt_range: PlotRange