diff --git a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md
index e69de29bb..578e8b609 100644
--- a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md	
+++ b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md	
@@ -0,0 +1,2 @@
+1. GM detector in appropriate holder. Power on NIM bin and 556 is shut off
+2. 556 high voltage supply - all
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