diff --git a/py/hexagram/thermo.py b/py/hexagram/thermo.py
index 82e2259..10c32aa 100644
--- a/py/hexagram/thermo.py
+++ b/py/hexagram/thermo.py
@@ -36,7 +36,7 @@ class Thermometer(BottomDial):
         cr.set_line_width(6.0)
 
         level = self.min_value
-        incr  = (self.max_value - self.min_value) / 9.0
+        incr  = (self.max_value - self.min_value) / 8.0
 
         for i in range(0, 9):
             level = self.min_value + i * incr