diff --git a/geomagio/Metadata.py b/geomagio/Metadata.py
index 34bba5f5e1c6cc83f144679df4097c2b2a6c3d0a..d335a1ffc71a81cb3c22dccceb1d95d09c4b632f 100644
--- a/geomagio/Metadata.py
+++ b/geomagio/Metadata.py
@@ -496,7 +496,7 @@ _INSTRUMENT_METADATA = [
             },
             # this info should get updated when available
             "electronics": {
-                "serial": "E558",
+                "serial": "E566",
                 # these scale values are used to convert voltage
                 # these are calculated using Ohm's law, given scaling resistor value (38.3 kohm), and given nT/mA values.
                 "x-scale": 944.935,  # nT/V