diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/BaseInstrument.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/BaseInstrument.java
index 7ad76cefd06..dc005da293c 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/BaseInstrument.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/BaseInstrument.java
@@ -24,13 +24,20 @@ abstract class BaseInstrument implements Instrument {
 
   private final String name;
   private final String description;
+  private final String unit;
   private final Map<String, String> constantLabels;
   private final List<String> labelKeys;
 
+  // All arguments cannot be null because they are checked in the abstract builder classes.
   BaseInstrument(
-      String name, String description, Map<String, String> constantLabels, List<String> labelKeys) {
+      String name,
+      String description,
+      String unit,
+      Map<String, String> constantLabels,
+      List<String> labelKeys) {
     this.name = name;
     this.description = description;
+    this.unit = unit;
     this.constantLabels = constantLabels;
     this.labelKeys = labelKeys;
   }
@@ -46,26 +53,20 @@ public boolean equals(Object o) {
 
     BaseInstrument that = (BaseInstrument) o;
 
-    if (name != null ? !name.equals(that.name) : that.name != null) {
-      return false;
-    }
-    if (description != null ? !description.equals(that.description) : that.description != null) {
-      return false;
-    }
-    if (constantLabels != null
-        ? !constantLabels.equals(that.constantLabels)
-        : that.constantLabels != null) {
-      return false;
-    }
-    return labelKeys != null ? labelKeys.equals(that.labelKeys) : that.labelKeys == null;
+    return name.equals(that.name)
+        && description.equals(that.description)
+        && unit.equals(that.unit)
+        && constantLabels.equals(that.constantLabels)
+        && labelKeys.equals(that.labelKeys);
   }
 
   @Override
   public int hashCode() {
-    int result = name != null ? name.hashCode() : 0;
-    result = 31 * result + (description != null ? description.hashCode() : 0);
-    result = 31 * result + (constantLabels != null ? constantLabels.hashCode() : 0);
-    result = 31 * result + (labelKeys != null ? labelKeys.hashCode() : 0);
+    int result = name.hashCode();
+    result = 31 * result + description.hashCode();
+    result = 31 * result + unit.hashCode();
+    result = 31 * result + constantLabels.hashCode();
+    result = 31 * result + labelKeys.hashCode();
     return result;
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleCounterSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleCounterSdk.java
index 5e086104a9c..84a8bcc0420 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleCounterSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleCounterSdk.java
@@ -29,10 +29,11 @@ final class DoubleCounterSdk extends BaseInstrument implements DoubleCounter {
   private DoubleCounterSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean monotonic) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.monotonic = monotonic;
   }
 
@@ -113,7 +114,12 @@ Builder getThis() {
     @Override
     public DoubleCounter build() {
       return new DoubleCounterSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isMonotonic());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isMonotonic());
     }
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java
index a2f9e53f885..aa72e3d1fc1 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java
@@ -29,10 +29,11 @@ final class DoubleMeasureSdk extends BaseInstrument implements DoubleMeasure {
   private DoubleMeasureSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean absolute) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.absolute = absolute;
   }
 
@@ -113,7 +114,12 @@ Builder getThis() {
     @Override
     public DoubleMeasure build() {
       return new DoubleMeasureSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isAbsolute());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isAbsolute());
     }
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleObserverSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleObserverSdk.java
index 168653bd2fb..116a7a237f5 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleObserverSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/DoubleObserverSdk.java
@@ -26,10 +26,11 @@ final class DoubleObserverSdk extends BaseInstrument implements DoubleObserver {
   DoubleObserverSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean monotonic) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.monotonic = monotonic;
   }
 
@@ -82,7 +83,12 @@ Builder getThis() {
     @Override
     public DoubleObserver build() {
       return new DoubleObserverSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isMonotonic());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isMonotonic());
     }
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongCounterSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongCounterSdk.java
index b689fd62496..faa41b4c8dd 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongCounterSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongCounterSdk.java
@@ -29,10 +29,11 @@ final class LongCounterSdk extends BaseInstrument implements LongCounter {
   private LongCounterSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean monotonic) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.monotonic = monotonic;
   }
 
@@ -113,7 +114,12 @@ Builder getThis() {
     @Override
     public LongCounter build() {
       return new LongCounterSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isMonotonic());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isMonotonic());
     }
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongMeasureSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongMeasureSdk.java
index c94e8fcde0d..e74d4dddfb5 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongMeasureSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongMeasureSdk.java
@@ -29,10 +29,11 @@ final class LongMeasureSdk extends BaseInstrument implements LongMeasure {
   private LongMeasureSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean absolute) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.absolute = absolute;
   }
 
@@ -113,7 +114,12 @@ Builder getThis() {
     @Override
     public LongMeasure build() {
       return new LongMeasureSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isAbsolute());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isAbsolute());
     }
   }
 }
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongObserverSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongObserverSdk.java
index e2af093bcdc..724dbd77c8e 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongObserverSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/LongObserverSdk.java
@@ -26,10 +26,11 @@ final class LongObserverSdk extends BaseInstrument implements LongObserver {
   LongObserverSdk(
       String name,
       String description,
+      String unit,
       Map<String, String> constantLabels,
       List<String> labelKeys,
       boolean monotonic) {
-    super(name, description, constantLabels, labelKeys);
+    super(name, description, unit, constantLabels, labelKeys);
     this.monotonic = monotonic;
   }
 
@@ -82,7 +83,12 @@ Builder getThis() {
     @Override
     public LongObserver build() {
       return new LongObserverSdk(
-          getName(), getDescription(), getConstantLabels(), getLabelKeys(), isMonotonic());
+          getName(),
+          getDescription(),
+          getUnit(),
+          getConstantLabels(),
+          getLabelKeys(),
+          isMonotonic());
     }
   }
 }