diff --git a/geomagio/Metadata.py b/geomagio/Metadata.py
index 66950625f31617593d7d33211153536762fb7f86..eb9ade2abe4a9f8667f424fa98119f0f99b95dec 100644
--- a/geomagio/Metadata.py
+++ b/geomagio/Metadata.py
@@ -39,9 +39,9 @@ _INSTRUMENT_METADATA = [
             "channels": {
                 # each channel maps to a list of components to calculate nT
                 # TODO: calculate these lists based on "FGE" type
-                "U": [{"channel": "U_Volt", "offset": 0, "scale": 313.2}],
+                "U": [{"channel": "U_Volt", "offset": 20613, "scale": 313.2}],
                 "V": [{"channel": "V_Volt", "offset": 0, "scale": 312.3}],
-                "W": [{"channel": "W_Volt", "offset": 0, "scale": 312.0}],
+                "W": [{"channel": "W_Volt", "offset": 47450, "scale": 312.0}],
             },
             "electronics": {
                 "serial": "E0542",