diff --git a/app/Filament/Resources/CharacteristicValueResource.php b/app/Filament/Resources/CharacteristicValueResource.php
index 7b53ae3..3ff0538 100644
--- a/app/Filament/Resources/CharacteristicValueResource.php
+++ b/app/Filament/Resources/CharacteristicValueResource.php
@@ -25,6 +25,7 @@ use Filament\Tables\Filters\Filter;
 use Filament\Tables\Table;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\SoftDeletingScope;
+use Str;
 
 class CharacteristicValueResource extends Resource
 {
@@ -187,14 +188,71 @@ class CharacteristicValueResource extends Resource
                 Forms\Components\TextInput::make('observed_value')
                     ->label('Observed Value')
                     ->reactive()
+                    ->afterStateUpdated(function ($state, $set, callable $get) {
+                        $plantId = $get('plant_id');
+                        $itemId = $get('item_id');
+                        $lineId = $get('line_id');
+                        $machineId = $get('machine_id');
+
+                        if (! $plantId || ! $itemId || ! $lineId || ! $machineId) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        if (Str::length($state) <= 0 || ! is_numeric($state) || ! preg_match('/^\d+(\.\d+)?$/', $state)
+                        ) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        $specVal = ProductCharacteristicsMaster::where('plant_id', $plantId)->where('item_id', $itemId)->where('line_id', $lineId)->where('machine_id', $machineId)->first();
+                        if (! $specVal) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        $lowLimit = $specVal?->lower ?? 0;
+                        $uppLimit = $specVal?->upper ?? 0;
+
+                        if (Str::length($lowLimit) <= 0 || ! is_numeric($lowLimit) || ! preg_match('/^\d+(\.\d+)?$/', $lowLimit)
+                        ) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        } elseif (Str::length($uppLimit) <= 0 || ! is_numeric($uppLimit) || ! preg_match('/^\d+(\.\d+)?$/', $uppLimit)
+                        ) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        if (($lowLimit == 0 && $uppLimit == 0) || ($uppLimit == 0)) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        if ($lowLimit > $state || $uppLimit < $state) {
+                            $set('status', 'NotOk');
+
+                            return;
+                        }
+
+                        $set('status', 'Ok');
+                    })
                     ->required(),
-                Forms\Components\Select::make('status')
+                Forms\Components\TextInput::make('status')// Select
                     ->label('Status')
-                    ->options([
-                        'Ok' => 'OK',
-                        'NotOk' => 'Not Ok',
-                    ])
+                    // ->options([
+                    //     'Ok' => 'OK',
+                    //     'NotOk' => 'Not Ok',
+                    // ])
                     ->reactive()
+                    ->default('NotOk')
+                    ->readOnly()
                     ->required(),
                 Forms\Components\Hidden::make('created_by')
                     ->label('Created By')