diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ ionpak
 
 A modern, low-cost universal controller for ionization vacuum gauges.
 
-![Prototype picture](https://raw.githubusercontent.com/m-labs/ionpak/master/proto_rev1_resized.jpg)
+![Prototype picture](https://raw.githubusercontent.com/m-labs/ionpak/master/proto_rev1_small.jpg)
 
 Flyback transformer construction
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diff --git a/proto_rev1_resized.jpg b/proto_rev1_resized.jpg
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diff --git a/proto_rev1_small.jpg b/proto_rev1_small.jpg
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