diff --git a/apps.json b/apps.json
index 95e259039..57bb04d20 100644
--- a/apps.json
+++ b/apps.json
@@ -584,7 +584,7 @@
   { "id": "hrm",
     "name": "Heart Rate Monitor",
     "icon": "heartrate.png",
-    "version":"0.02",
+    "version":"0.03",
     "description": "Measure your heart rate and see live sensor data",
     "tags": "health",
     "storage": [
diff --git a/apps/hrm/ChangeLog b/apps/hrm/ChangeLog
index 5715e07c7..1efe78c07 100644
--- a/apps/hrm/ChangeLog
+++ b/apps/hrm/ChangeLog
@@ -1,2 +1,3 @@
 0.01: New App!
 0.02: Use HRM data and calculations from Bangle.js (don't access hardware directly)
+0.03: Fix timing issues, and use 1/2 scale to keep graph on screen
diff --git a/apps/hrm/heartrate.js b/apps/hrm/heartrate.js
index 6f0a176d3..1ec0a31d2 100644
--- a/apps/hrm/heartrate.js
+++ b/apps/hrm/heartrate.js
@@ -12,7 +12,10 @@ function onHRM(h) {
   hrmInfo = h;
   hrmOffset = 0;
   if (hrmInterval) clearInterval(hrmInterval);
-  hrmInterval = setInterval(readHRM,40);
+  hrmInterval = undefined;
+  setTimeout(function() {
+    hrmInterval = setInterval(readHRM,41);
+  }, 40);
 
   var px = g.getWidth()/2;
   g.setFontAlign(0,0);
@@ -35,7 +38,6 @@ function countDown() {
 countDown();
 
 
-var min=0,max=0;
 var wasHigh = 0, wasLow = 0;
 var lastHigh = getTime();
 var hrmList = [];
@@ -51,9 +53,7 @@ function readHRM() {
   for (var i=0;i<2;i++) {
     var a = hrmInfo.raw[hrmOffset];
     hrmOffset++;
-    min=Math.min(min*0.97+a*0.03,a);
-    max=Math.max(max*0.97+a*0.03,a);
-    y = E.clip(170 - (a*4),100,230);
+    y = E.clip(170 - (a*2),100,230);
     g.setColor(1,1,1);
     g.lineTo(hrmOffset, y);
   }