diff --git a/tests/humidity/ah_calculator.py b/tests/humidity/ah_calculator.py
index <HASH>..<HASH> 100755
--- a/tests/humidity/ah_calculator.py
+++ b/tests/humidity/ah_calculator.py
@@ -19,7 +19,7 @@ rh = 60
 t = 25
 
 print("t: %s rh: %s" % (t, rh))
-print("-")
+print("=")
 
 
 tk = t + 273.15
@@ -82,7 +82,7 @@ print("-")
 
 # Pw = RH × Pws  ⁄  100
 
-pw = rh * pws / 100
+pw = pws * (rh / 100)
 
 print("pw: %s" % pw)
 print("-")
@@ -93,7 +93,7 @@ print("-")
 ah = pw / (rw * tk)
 
 print("ah1: %s" % ah)
-print("-")
+print("=")
 
 
 # --------------------------------------------------------------------------------------------------------------------
Added aH calculator script.