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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-2.2.4.js"></script>
​
  <button class="select-changer" data-direction="up">UP</button> 
  <button class="select-changer" data-direction="down">DOWN</button>
  
  <br>
  <br>
  
  <select name="select" id="select">
    <option value="001">001</option>
    <option value="002">002</option>
    <option value="003">003</option>
    <option value="004">004</option>
    <option value="005">005</option>
    <option value="006">006</option>
    <option value="007">007</option>
    <option value="008">008</option>
    <option value="009">009</option>
    <option value="010">010</option>
  </select>
  
</body>
</html>
 
$(document).on('click', '.select-changer', function(e) {
  var direction = $(this).data('direction');
  var $select = $('#select');
  var $currentOption = $select.find(':selected');
  var $nextOption = direction == 'down' ?
    $currentOption.next() : $currentOption.prev();
​
  if ($nextOption.length) {
    $select.val($nextOption.attr('value'));
  }
​
});
Output

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anonymouspro
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