diff --git a/aws/cwatch/client.go b/aws/cwatch/client.go
index 47478cc..c3cb874 100644
--- a/aws/cwatch/client.go
+++ b/aws/cwatch/client.go
@@ -28,7 +28,7 @@ func (c *DevClient) PutMetricData(ctx context.Context, params *cloudwatch.PutMet
 		for _, dim := range md.Dimensions {
 			log = log.With(strings.ToLower(aws.ToString(dim.Name)), aws.ToString(dim.Value))
 		}
-		log.With("metric", aws.ToString(md.MetricName), "value", aws.ToFloat64(md.Value)).Info("put metric data")
+		log.With("metric", aws.ToString(md.MetricName), "value", aws.ToFloat64(md.Value), "unit", md.Unit).Info("put metric data")
 	}
 
 	c.callCount.Add(1)
diff --git a/aws/cwatch/service.go b/aws/cwatch/service.go
index d8caa7d..5ae07ea 100644
--- a/aws/cwatch/service.go
+++ b/aws/cwatch/service.go
@@ -20,7 +20,8 @@ type Service struct {
 	batcher    *syncx.Batcher[types.MetricDatum]
 }
 
-// NewService creates a new Cloudwatch service with the given credentials and configuration
+// NewService creates a new Cloudwatch service with the given credentials and configuration. If deployment is "dev" then
+// then instead of a real Cloudwatch client, the service will get a mocked version that just logs metrics.
 func NewService(accessKey, secretKey, region, namespace, deployment string) (*Service, error) {
 	var client Client
 
@@ -75,6 +76,6 @@ func (s *Service) Prepare(data []types.MetricDatum) *cloudwatch.PutMetricDataInp
 func (s *Service) processBatch(batch []types.MetricDatum) {
 	_, err := s.Client.PutMetricData(context.TODO(), s.Prepare(batch))
 	if err != nil {
-		slog.Error("error sending metrics to cloudwatch", "error", err, "count", len(batch))
+		slog.Error("error sending metric data batch", "error", err, "count", len(batch))
 	}
 }
diff --git a/aws/cwatch/service_test.go b/aws/cwatch/service_test.go
index 481834e..6f844aa 100644
--- a/aws/cwatch/service_test.go
+++ b/aws/cwatch/service_test.go
@@ -46,13 +46,13 @@ func TestService(t *testing.T) {
 
 	// test writing metrics directly via the client
 	_, err = svc.Client.PutMetricData(context.Background(), svc.Prepare([]types.MetricDatum{
-		{MetricName: aws.String("NumGoats"), Value: aws.Float64(10)},
-		{MetricName: aws.String("NumSheep"), Dimensions: []types.Dimension{{Name: aws.String("Host"), Value: aws.String("foo1")}}, Value: aws.Float64(20)},
+		{MetricName: aws.String("NumGoats"), Value: aws.Float64(10), Unit: types.StandardUnitCount},
+		{MetricName: aws.String("NumSheep"), Dimensions: []types.Dimension{{Name: aws.String("Host"), Value: aws.String("foo1")}}, Value: aws.Float64(20), Unit: types.StandardUnitCount},
 	}))
 	assert.NoError(t, err)
 
 	// test queuing metrics to be sent by batching process
-	svc.Queue(types.MetricDatum{MetricName: aws.String("NumFish"), Value: aws.Float64(30)})
+	svc.Queue(types.MetricDatum{MetricName: aws.String("SleepTime"), Value: aws.Float64(30), Unit: types.StandardUnitSeconds})
 
 	svc.StopQueue()
 	wg.Wait()