diff --git a/geomagio/Metadata.py b/geomagio/Metadata.py
index 76e5a0e47dc6d71bbb7632fa28b8f0f53cc85066..37e788794b10035569faa55fef5a12f7d85d45d9 100644
--- a/geomagio/Metadata.py
+++ b/geomagio/Metadata.py
@@ -166,23 +166,31 @@ _INSTRUMENT_METADATA = [
     {
         "network": "NT",
         "station": "BRW",
-        "start_time": None,
+        "start_time": UTCDateTime("2023-10-23T19:00:00.000Z"),
         "end_time": None,
         "instrument": {
-            "type": "Narod",
+            "type": "FGE",
             "channels": {
-                "U": [
-                    {"channel": "U_Volt", "offset": 0, "scale": 100},
-                    {"channel": "U_Bin", "offset": 0, "scale": 506},
-                ],
-                "V": [
-                    {"channel": "V_Volt", "offset": 0, "scale": 100},
-                    {"channel": "V_Bin", "offset": 0, "scale": 505.6},
-                ],
-                "W": [
-                    {"channel": "W_Volt", "offset": 0, "scale": 100},
-                    {"channel": "W_Bin", "offset": 0, "scale": 506},
-                ],
+                # each channel maps to a list of components to calculate nT
+                # TODO: calculate these lists based on "FGE" type
+                "U": [{"channel": "U_Volt", "offset": 9217, "scale": 5797.3}],
+                "V": [{"channel": "V_Volt", "offset": 0, "scale": 5777.6}],
+                "W": [{"channel": "W_Volt", "offset": 56442, "scale": 5895.6}],
+            },
+            "electronics": {
+                "serial": "????",
+                # these scale values are calculated manually.
+                "x-scale": 5797.3,  # nT/V
+                "y-scale": 5777.6,  # nT/V
+                "z-scale": 5895.6,  # nT/V
+                "temperature-scale": 0.01,  # V/K
+            },
+            "sensor": {
+                "serial": "????",
+                # these constants combine with instrument setting for offset
+                "x-constant": None,  # nT/mA
+                "y-constant": None,  # nT/mA
+                "z-constant": None,  # nT/mA
             },
         },
     },
@@ -1007,4 +1015,27 @@ _INSTRUMENT_METADATA = [
             },
         },
     },
+    {
+        "network": "NT",
+        "station": "BRW",
+        "start_time": None,
+        "end_time": UTCDateTime("2023-10-23T20:00:00.000Z"),
+        "instrument": {
+            "type": "Narod",
+            "channels": {
+                "U": [
+                    {"channel": "U_Volt", "offset": 0, "scale": 100},
+                    {"channel": "U_Bin", "offset": 0, "scale": 506},
+                ],
+                "V": [
+                    {"channel": "V_Volt", "offset": 0, "scale": 100},
+                    {"channel": "V_Bin", "offset": 0, "scale": 505.6},
+                ],
+                "W": [
+                    {"channel": "W_Volt", "offset": 0, "scale": 100},
+                    {"channel": "W_Bin", "offset": 0, "scale": 506},
+                ],
+            },
+        },
+    },
 ]