diff --git a/interfaces.hpp b/interfaces.hpp
index 8e7fc0b..c16d19e 100644
--- a/interfaces.hpp
+++ b/interfaces.hpp
@@ -6,6 +6,10 @@
 struct ReadReturn {
     double value;
     std::chrono::high_resolution_clock::time_point updated;
+
+    bool operator==(const ReadReturn &rhs) const {
+        return (this->value == rhs.value && this->updated == rhs.updated);
+    }
 };