diff --git a/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultMetricExporter.m b/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultMetricExporter.m
index 6516c43..55029a6 100644
--- a/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultMetricExporter.m
+++ b/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultMetricExporter.m
@@ -1,4 +1,4 @@
-function dexp = defaultMetricExporter
+function dexp = defaultMetricExporter(varargin)
 % Get the default Metric exporter depending on installation
 %    EXP = OPENTELEMETRY.EXPORTERS.OTLP.DEFAULTMETRICEXPORTER returns the 
 %    default Metric exporter. OtlpHttpMetricExporter is the default if it is 
@@ -10,7 +10,7 @@
 % Copyright 2023 The MathWorks, Inc.
 
 if exist("opentelemetry.exporters.otlp.OtlpHttpMetricExporter", "class")
-    dexp = opentelemetry.exporters.otlp.OtlpHttpMetricExporter;
+    dexp = opentelemetry.exporters.otlp.OtlpHttpMetricExporter(varargin{:});
 else
-    dexp = opentelemetry.exporters.otlp.OtlpGrpcMetricExporter;
+    dexp = opentelemetry.exporters.otlp.OtlpGrpcMetricExporter(varargin{:});
 end
diff --git a/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultSpanExporter.m b/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultSpanExporter.m
index 90009eb..85c2076 100644
--- a/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultSpanExporter.m
+++ b/exporters/otlp/+opentelemetry/+exporters/+otlp/defaultSpanExporter.m
@@ -1,4 +1,4 @@
-function dexp = defaultSpanExporter
+function dexp = defaultSpanExporter(varargin)
 % Get the default span exporter depending on installation
 %    EXP = OPENTELEMETRY.EXPORTERS.OTLP.DEFAULTSPANEXPORTER returns the 
 %    default span exporter. OtlpHttpSpanExporter is the default if it is 
@@ -10,7 +10,7 @@
 % Copyright 2023 The MathWorks, Inc.
 
 if exist("opentelemetry.exporters.otlp.OtlpHttpSpanExporter", "class")
-    dexp = opentelemetry.exporters.otlp.OtlpHttpSpanExporter;
+    dexp = opentelemetry.exporters.otlp.OtlpHttpSpanExporter(varargin{:});
 else
-    dexp = opentelemetry.exporters.otlp.OtlpGrpcSpanExporter;
+    dexp = opentelemetry.exporters.otlp.OtlpGrpcSpanExporter(varargin{:});
 end
diff --git a/test/tmetrics.m b/test/tmetrics.m
index 96adc99..5f34462 100644
--- a/test/tmetrics.m
+++ b/test/tmetrics.m
@@ -25,10 +25,10 @@ function setupOnce(testCase)
             interval = seconds(2);
             timeout = seconds(1);
             testCase.ShortIntervalReader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(...
-                opentelemetry.exporters.otlp.OtlpHttpMetricExporter(), ...
+                opentelemetry.exporters.otlp.defaultMetricExporter(), ...
                 "Interval", interval, "Timeout", timeout);
             testCase.DeltaAggregationReader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(...
-                opentelemetry.exporters.otlp.OtlpHttpMetricExporter(...
+                opentelemetry.exporters.otlp.defaultMetricExporter(...
                 "PreferredAggregationTemporality", "Delta"), ...
                 "Interval", interval, "Timeout", timeout);
         end
diff --git a/test/tmetrics_sdk.m b/test/tmetrics_sdk.m
index 9fc82ba..8c9a181 100644
--- a/test/tmetrics_sdk.m
+++ b/test/tmetrics_sdk.m
@@ -21,7 +21,7 @@
         function setupOnce(testCase)
             commonSetupOnce(testCase);
             testCase.ShortIntervalReader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(...
-                opentelemetry.exporters.otlp.OtlpHttpMetricExporter(), ...
+                opentelemetry.exporters.otlp.defaultMetricExporter(), ...
                 "Interval", seconds(2), "Timeout", seconds(1));
         end
     end
@@ -41,8 +41,8 @@ function teardown(testCase)
     methods (Test)
         function testDefaultExporter(testCase)
             exporter = opentelemetry.exporters.otlp.defaultMetricExporter;
-            verifyEqual(testCase, string(class(exporter)), "opentelemetry.exporters.otlp.OtlpHttpMetricExporter");
-            verifyEqual(testCase, string(exporter.Endpoint), "http://localhost:4318/v1/metrics");
+            % do not test the exporter class or the endpoint, as they
+            % depend on which exporters are installed
             verifyEqual(testCase, exporter.Timeout, seconds(10));
             verifyEqual(testCase, string(exporter.PreferredAggregationTemporality), "cumulative");
         end
@@ -51,7 +51,7 @@ function testDefaultExporter(testCase)
         function testExporterBasic(testCase)
             timeout = seconds(5);
             temporality = "delta";
-            exporter = opentelemetry.exporters.otlp.OtlpHttpMetricExporter("Timeout", timeout, ...
+            exporter = opentelemetry.exporters.otlp.defaultMetricExporter("Timeout", timeout, ...
                 "PreferredAggregationTemporality", temporality);
             verifyEqual(testCase, exporter.Timeout, timeout);
             verifyEqual(testCase, string(exporter.PreferredAggregationTemporality), temporality);
@@ -60,8 +60,8 @@ function testExporterBasic(testCase)
         
         function testDefaultReader(testCase)
             reader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader();
-            verifyEqual(testCase, string(class(reader.MetricExporter)), ...
-                "opentelemetry.exporters.otlp.OtlpHttpMetricExporter");
+            verifyEqual(testCase, class(reader.MetricExporter), ...
+                class(opentelemetry.exporters.otlp.defaultMetricExporter));
             verifyEqual(testCase, reader.Interval, minutes(1));
             verifyEqual(testCase, reader.Interval.Format, 'm');  
             verifyEqual(testCase, reader.Timeout, seconds(30));
@@ -86,9 +86,9 @@ function testReaderBasic(testCase)
         function testAddMetricReader(testCase)
             metername = "foo";
             countername = "bar";
-            exporter1 = opentelemetry.exporters.otlp.OtlpHttpMetricExporter(...
+            exporter1 = opentelemetry.exporters.otlp.defaultMetricExporter(...
                 "PreferredAggregationTemporality", "delta");
-            exporter2 = opentelemetry.exporters.otlp.OtlpHttpMetricExporter(...
+            exporter2 = opentelemetry.exporters.otlp.defaultMetricExporter(...
                 "PreferredAggregationTemporality", "delta");
             reader1 = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(exporter1, ...,
                 "Interval", seconds(2), "Timeout", seconds(1));