diff --git a/geomagio/Metadata.py b/geomagio/Metadata.py
index 6d4908792f89cb4216a9a13ea9af688249a6cbc4..cc78c445c3ec9fdd556b35ff921c0f31aa8f2921 100644
--- a/geomagio/Metadata.py
+++ b/geomagio/Metadata.py
@@ -593,7 +593,7 @@ _INSTRUMENT_METADATA = [
                 # TODO: calculate these lists based on "FGE" type
                 "U": [{"channel": "U_Volt", "offset": 24024, "scale": 978.355}],
                 "V": [{"channel": "V_Volt", "offset": 0, "scale": 965.901}],
-                "W": [{"channel": "W_Volt", "offset": 39999, "scale": 954.543}],
+                "W": [{"channel": "W_Volt", "offset": 40040, "scale": 954.543}],
             },
             # this info should get updated when available
             "electronics": {