diff --git a/check_raspi_voltage b/check_raspi_voltage
new file mode 100755
index 0000000..ccc5f23
--- /dev/null
+++ b/check_raspi_voltage
@@ -0,0 +1,27 @@
+#!/bin/python3
+#
+import argparse
+import nagios
+import subprocess
+
+
+if __name__ == "__main__":
+    throttled = subprocess.check_output(['vcgencmd', 'get_throttled']).decode('utf-8')
+    try:
+        tval = throttled[throttled.index('=')+1:]
+        tval = int(tval, 16)
+    except ValueError:
+        tval = None
+    #
+    n = nagios.Nagios()
+    #
+    if tval is None:
+        status = n.UNKNOWN
+    elif tval & 0x4000 != 0:
+        status = n.ERROR
+    elif tval != 0:
+        status = n.WARNING
+    else:
+        status = n.OK
+    #
+    n.exit(status, f"Overtemperature state ({throttled})")