bug fixes for measurement container lagged retrieval-> unit conversion and sample output

src/measurements/examples.js

@@ -175,6 +175,25 @@ const downstreamData = basicContainer
   .position('downstream')
   .get();
 
+  //check wether a serie exists
+const hasSeries = measurements
+  .type("flow")
+  .variant("measured")
+  .exists();                // true if any position exists
+
+const hasUpstreamValues = measurements
+  .type("flow")
+  .variant("measured")
+  .exists({ position: "upstream", requireValues: true });
+
+// Passing everything explicitly
+const hasPercent = measurements.exists({
+  type: "volume",
+  variant: "percent",
+  position: "atEquipment",
+});
+
+
 console.log(`Downstream: ${downstreamVal} ${downstreamData.unit} at ${downstreamData.distance}m\n`);
 
 // ====================================