diff --git a/installations/forms.py b/installations/forms.py
index 86e7428..e877b2b 100644
--- a/installations/forms.py
+++ b/installations/forms.py
@@ -20,7 +20,7 @@ class InstallationReportForm(forms.ModelForm):
         model = InstallationReport
         fields = [
             'visited_date', 'new_water_meter_serial', 'seal_number',
-            'utm_x', 'utm_y', 'meter_type', 'meter_size',
+            'utm_x', 'utm_y', 'meter_type', 'meter_size', 'meter_model',
             'discharge_pipe_diameter', 'usage_type', 'exploitation_license_number',
             'motor_power', 'pre_calibration_flow_rate', 'post_calibration_flow_rate',
             'water_meter_manufacturer', 'sim_number', 'driving_force',
@@ -62,6 +62,13 @@ class InstallationReportForm(forms.ModelForm):
             'meter_size': forms.TextInput(attrs={
                 'class': 'form-control'
             }),
+            'meter_model': forms.Select(attrs={
+                'class': 'form-select'
+            }, choices=[
+                ('', 'انتخاب کنید'),
+                ('A', 'A'),
+                ('B', 'B')
+            ]),
             'discharge_pipe_diameter': forms.NumberInput(attrs={
                 'class': 'form-control',
                 'min': '0',
diff --git a/installations/models.py b/installations/models.py
index 6eed7a5..6cd48bd 100644
--- a/installations/models.py
+++ b/installations/models.py
@@ -47,6 +47,11 @@ class InstallationReport(BaseModel):
         ('volumetric', 'حجمی'),
     ]
     meter_type = models.CharField(max_length=20, choices=METER_TYPE_CHOICES, null=True, blank=True, verbose_name='نوع کنتور')
+    METER_MODEL_CHOICES = [
+        ('A', 'A'),
+        ('B', 'B'),
+    ]
+    meter_model = models.CharField(max_length=20, choices=METER_MODEL_CHOICES, null=True, blank=True, verbose_name='مدل کنتور')
     meter_size = models.CharField(max_length=50, null=True, blank=True, verbose_name='سایز کنتور')
     discharge_pipe_diameter = models.PositiveIntegerField(null=True, blank=True, verbose_name='قطر لوله آبده (اینچ)')
     USAGE_TYPE_CHOICES = [
diff --git a/installations/templates/installations/installation_report_step.html b/installations/templates/installations/installation_report_step.html
index 5f6020f..745fc45 100644
--- a/installations/templates/installations/installation_report_step.html
+++ b/installations/templates/installations/installation_report_step.html
@@ -86,7 +86,11 @@
                   <p class="text-nowrap mb-2"><i class="bx bx-purchase-tag bx-sm me-2"></i>سریال جدید: {{ report.new_water_meter_serial|default:'-' }}</p>
                   <p class="text-nowrap mb-2"><i class="bx bx-lock-alt bx-sm me-2"></i>شماره پلمپ: {{ report.seal_number|default:'-' }}</p>
                   <p class="text-nowrap mb-2"><i class="bx bx-chip bx-sm me-2"></i>نوع کنتور: {{ report.get_meter_type_display|default:'-' }}</p>
+                  {% if report.meter_type == 'smart' %}
+                  <p class="text-nowrap mb-2"><i class="bx bx-chip bx-sm me-2"></i>مدل کنتور: {{ report.get_meter_model_display|default:'-' }}</p>
+                  {% else %}
                   <p class="text-nowrap mb-2"><i class="bx bx-ruler bx-sm me-2"></i>سایز کنتور: {{ report.meter_size|default:'-' }}</p>
+                  {% endif %}
                   <p class="text-nowrap mb-2"><i class="bx bx-tachometer bx-sm me-2"></i>قطر لوله آبده (اینچ): {{ report.discharge_pipe_diameter|default:'-' }}</p>
                   <p class="text-nowrap mb-2"><i class="bx bx-building bx-sm me-2"></i>سازنده کنتور: {{ report.water_meter_manufacturer|default:'-' }}</p>
                   <p class="text-nowrap mb-2"><i class="bx bx-sim-card bx-sm me-2"></i>شماره سیمکارت: {{ report.sim_number|default:'-' }}</p>
@@ -279,13 +283,20 @@
                       <div class="invalid-feedback">{{ form.meter_type.errors.0 }}</div>
                     {% endif %}
                   </div>
-                  <div class="col-md-3">
+                  <div class="col-md-3" id="meter_size_wrapper">
                     {{ form.meter_size.label_tag }}
                     {{ form.meter_size }}
                     {% if form.meter_size.errors %}
                       <div class="invalid-feedback">{{ form.meter_size.errors.0 }}</div>
                     {% endif %}
                   </div>
+                  <div class="col-md-3" id="meter_model_wrapper">
+                    {{ form.meter_model.label_tag }}
+                    {{ form.meter_model }}
+                    {% if form.meter_model.errors %}
+                      <div class="invalid-feedback">{{ form.meter_size.errors.0 }}</div>
+                    {% endif %}
+                  </div>
                   <div class="col-md-3">
                     {{ form.discharge_pipe_diameter.label_tag }}
                     {{ form.discharge_pipe_diameter }}
@@ -329,7 +340,7 @@
                     {% endif %}
                   </div>
                   <div class="col-md-3">
-                    {{ form.water_meter_manufacturer.label_tag }}
+                    {{ form.water_meter_manufacturer.label_tag }}حجمی
                     <div class="input-group">
                       {{ form.water_meter_manufacturer }}
                       {{ form.new_manufacturer }}
@@ -759,6 +770,47 @@
       }
     }
   }
+
+  // Dynamic meter field visibility based on meter type
+  (function() {
+    const meterTypeSelect = document.getElementById('{{ form.meter_type.id_for_label }}');
+    const meterSizeWrapper = document.getElementById('meter_size_wrapper');
+    const meterModelWrapper = document.getElementById('meter_model_wrapper');
+
+    function updateMeterFields() {
+      if (!meterTypeSelect) return;
+      
+      const selectedType = meterTypeSelect.value;
+      
+      if (selectedType === 'smart') {
+        // Show meter_model, hide meter_size
+        meterModelWrapper.style.display = '';
+        meterSizeWrapper.style.display = 'none';
+        // Clear meter_size value when hidden
+        const meterSizeInput = meterSizeWrapper.querySelector('input, select');
+        if (meterSizeInput) meterSizeInput.value = '';
+      } else if (selectedType === 'volumetric') {
+        // Show meter_size, hide meter_model
+        meterSizeWrapper.style.display = '';
+        meterModelWrapper.style.display = 'none';
+        // Clear meter_model value when hidden
+        const meterModelSelect = meterModelWrapper.querySelector('select');
+        if (meterModelSelect) meterModelSelect.value = '';
+      } else {
+        // No selection: hide both
+        meterSizeWrapper.style.display = 'none';
+        meterModelWrapper.style.display = 'none';
+      }
+    }
+
+    // Initial update on page load
+    updateMeterFields();
+
+    // Update on change
+    if (meterTypeSelect) {
+      meterTypeSelect.addEventListener('change', updateMeterFields);
+    }
+  })();
 </script>
 {% endblock %}