/pebble?units=mmol

Is this converting everything correctly?

lib/pebble.js

@@ -20,36 +20,50 @@ function directionToTrend (direction) {
 }
 
 function pebble (req, res) {
-  var FORTY_MINUTES = 2400000;
+  var FORTY_MINUTES = 2400000,
+    cgmData = [ ],
+    units = req.query.units,
+    useMetricBg = false
+  ;
+
+  if (units == "mmol") {
+    useMetricBg = true;
+  }
+
+  function scaleBg(bg) {
+      if (useMetricBg) {
+          return (Math.round((bg / 18) * 10) / 10).toFixed(1);
+      } else
+          return bg;
+  }
 
-  var cgmData = [ ];
   function get_latest (err, results) {
     var now = Date.now();
-        results.forEach(function(element, index, array) {
-            var next = null;
-            if (index + 1 < results.length) {
-              next = results[index + 1];
-            }
-            if (element) {
-                var obj = {};
-                obj.sgv = element.sgv;
-                obj.bgdelta = (next ? (element.sgv - next.sgv ) : 0);
-                if ('direction' in element) {
-                  obj.trend = directionToTrend(element.direction);
-                  obj.direction = element.direction;
-                }
-                // obj.y = element.sgv;
-                // obj.x = element.date;
-                obj.datetime = element.date;
-                // obj.date = element.date.toString( );
-                cgmData.push(obj);
+    results.forEach(function(element, index, array) {
+        var next = null;
+        if (index + 1 < results.length) {
+          next = results[index + 1];
+        }
+        if (element) {
+            var obj = {};
+            obj.sgv = scaleBg(element.sgv);
+            obj.bgdelta = (next ? (scaleBg(element.sgv) - scaleBg(next.sgv) ) : 0);
+            if ('direction' in element) {
+              obj.trend = directionToTrend(element.direction);
+              obj.direction = element.direction;
             }
-        });
-        var result = { status: [ {now:now}], bgs: cgmData.slice(0, 1) };
-        res.setHeader('content-type', 'application/json');
-        res.write(JSON.stringify(result));
-        res.end( );
-        // collection.db.close();
+            // obj.y = element.sgv;
+            // obj.x = element.date;
+            obj.datetime = element.date;
+            // obj.date = element.date.toString( );
+            cgmData.push(obj);
+        }
+    });
+    var result = { status: [ {now:now}], bgs: cgmData.slice(0, 1) };
+    res.setHeader('content-type', 'application/json');
+    res.write(JSON.stringify(result));
+    res.end( );
+    // collection.db.close();
   }
   req.entries.list({count: 2}, get_latest);
 }
@@ -63,4 +77,3 @@ function configure (entries) {
 
 configure.pebble = pebble;
 module.exports = configure;
-