diff --git a/20230518_conductivity_sensor_board_print.pdf b/20230518_conductivity_sensor_board_print.pdf
new file mode 100644
index 0000000..62f5bc6
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diff --git a/20230518_conductivity_sensor_board_render.jpg b/20230518_conductivity_sensor_board_render.jpg
new file mode 100644
index 0000000..ca803c5
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diff --git a/20230518_conductivity_sensor_schematic.pdf b/20230518_conductivity_sensor_schematic.pdf
new file mode 100644
index 0000000..b76d93e
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diff --git a/conductivity_sensor.kicad_sch b/conductivity_sensor.kicad_sch
index a96b9e0..6274da5 100644
--- a/conductivity_sensor.kicad_sch
+++ b/conductivity_sensor.kicad_sch
@@ -1726,7 +1726,7 @@
   (symbol (lib_id "power:GND") (at 150.495 38.735 0) (unit 1)
     (in_bom yes) (on_board yes) (fields_autoplaced)
     (uuid 062841a4-d84d-483b-9a26-3a32f3ad2f5e)
-    (property "Reference" "#PWR?" (id 0) (at 150.495 45.085 0)
+    (property "Reference" "#PWR0103" (id 0) (at 150.495 45.085 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (property "Value" "GND" (id 1) (at 150.495 43.815 0))
@@ -3006,7 +3006,7 @@
       (reference "#PWR0102") (unit 1) (value "GND") (footprint "")
     )
     (path "/062841a4-d84d-483b-9a26-3a32f3ad2f5e"
-      (reference "#PWR?") (unit 1) (value "GND") (footprint "")
+      (reference "#PWR0103") (unit 1) (value "GND") (footprint "")
     )
     (path "/87818eb9-b8ff-462a-b8b7-f38093622aa8"
       (reference "1k2") (unit 1) (value "NC") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")