diff --git a/java_console/io/src/main/java/com/rusefi/io/can/PCanIoStream.java b/java_console/io/src/main/java/com/rusefi/io/can/PCanIoStream.java
index b58c8fa3f5..6279649cd1 100644
--- a/java_console/io/src/main/java/com/rusefi/io/can/PCanIoStream.java
+++ b/java_console/io/src/main/java/com/rusefi/io/can/PCanIoStream.java
@@ -135,4 +135,11 @@ public class PCanIoStream extends AbstractIoStream {
     public IncomingDataBuffer getDataBuffer() {
         return dataBuffer;
     }
+
+    @Override
+    public String toString() {
+        return "PCanIoStream{" + PCanHelper.CHANNEL + ", " +
+            "totalCounter=" + totalCounter +
+            '}';
+    }
 }
diff --git a/java_console/io/src/main/java/com/rusefi/io/serial/RateCounter.java b/java_console/io/src/main/java/com/rusefi/io/serial/RateCounter.java
index 8fad5a926c..437f2ed695 100644
--- a/java_console/io/src/main/java/com/rusefi/io/serial/RateCounter.java
+++ b/java_console/io/src/main/java/com/rusefi/io/serial/RateCounter.java
@@ -40,6 +40,13 @@ public class RateCounter {
         timeStamps.add(new Pair(timestamp, 1));
     }
 
+    @Override
+    public String toString() {
+        return "RateCounter{" +
+            getSizeForUnitTest() +
+            '}';
+    }
+
     private static class Pair {
         private final long timestamp;
         private final int value;