diff --git a/cpdctrl/measurement.py b/cpdctrl/measurement.py
index bdb08bc..c50963e 100644
--- a/cpdctrl/measurement.py
+++ b/cpdctrl/measurement.py
@@ -77,7 +77,7 @@ def measure(
     """
     get_time = lambda: datetime.datetime.now().strftime("%Y-%m-%d_%H:%M:%S")
     if add_measurement_info_to_metadata:
-        data.metadata["measurement_interval"] = str(delta_t) + " s"
+        data.metadata["measurement_interval"] = str(delta_t)
         data.metadata["measurement_use_buffer"] = str(use_buffer)
         data.metadata["measurement_voltage_device"] = str(vm_dev)
         data.metadata["measurement_led_device"] = str(led_dev)