diff --git a/src/metrology_apis/__init__.py b/src/metrology_apis/__init__.py
index 2fa8280..9deff66 100644
--- a/src/metrology_apis/__init__.py
+++ b/src/metrology_apis/__init__.py
@@ -44,3 +44,62 @@ def unit(self) -> U: ...
     def __eq__[B](  # type: ignore[override]  # pyright: ignore[reportIncompatibleMethodOverride]
         self: "Quantity[V, U]", other: "Quantity[op.CanEq[V, B], U]", /
     ) -> B: ...
+
+    @override
+    def __ne__[B](  # type: ignore[override]  # pyright: ignore[reportIncompatibleMethodOverride]
+        self: "Quantity[V, U]", other: "Quantity[op.CanEq[V, B], U]", /
+    ) -> B: ...
+
+    def __lt__[B](
+        self: "Quantity[V, U]", other: "Quantity[op.CanLt[V, B], U]", /
+    ) -> B: ...
+    def __le__[B](
+        self: "Quantity[V, U]", other: "Quantity[op.CanLe[V, B], U]", /
+    ) -> B: ...
+    def __gt__[B](
+        self: "Quantity[V, U]", other: "Quantity[op.CanGt[V, B], U]", /
+    ) -> B: ...
+    def __ge__[B](
+        self: "Quantity[V, U]", other: "Quantity[op.CanGe[V, B], U]", /
+    ) -> B: ...
+
+    def __pos__[R](self: "Quantity[op.CanPos[R], U]") -> "Quantity[R, U]": ...
+    def __neg__[R](self: "Quantity[op.CanNeg[R], U]") -> "Quantity[R, U]": ...
+    def __abs__[R](self: "Quantity[op.CanAbs[R], U]") -> "Quantity[R, U]": ...
+
+    def __add__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanRAdd[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __radd__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanAdd[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __sub__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanRSub[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __rsub__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanSub[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+
+    def __mul__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanRMul[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __rmul__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanMul[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __truediv__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanRTruediv[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+    def __rtruediv__[R](
+        self: "Quantity[V, U]", other: "Quantity[op.CanTruediv[V, R], U]", /
+    ) -> "Quantity[R, U]": ...
+
+    def __pow__[R](
+        self: "Quantity[op.CanPow2[op.JustInt | op.JustFloat, R], U]",
+        other: op.JustInt | op.JustFloat,
+        /,
+    ) -> "Quantity[R, U]": ...
+    def __rpow__[R](
+        self: "Quantity[op.CanRPow[op.JustInt | op.JustFloat, R], U]",
+        other: op.JustInt | op.JustFloat,
+        /,
+    ) -> "Quantity[R, U]": ...