diff --git a/inductor_imp.html b/inductor_imp.html
index 2b4028c..65a7767 100644
--- a/inductor_imp.html
+++ b/inductor_imp.html
@@ -20,7 +20,7 @@
                 </div>
                 <div class="sliders">
                     <label for="loop_diameter_slider">&#8960b:</label>
-                    <input type="range" id="loop_diameter_slider" min="0.25" max="2.0" value="1.00" step="0.01">
+                    <input type="range" id="loop_diameter_slider" min="0.20" max="4.0" value="1.00" step="0.01">
                 </div>
                 <div class="sliders">
                     <label for="loop_spacing_slider">c/a:</label>