function slider_value(value) {
var slider = document.getElementById("myRange");
var output = document.getElementById("demo");
var slider2 = document.getElementById("myRange2");
var output2 = document.getElementById("demo2");

output.innerHTML = slider.value;

slider.oninput = function () {
output.innerHTML = value;
}
slider2.oninput2 = function () {
output2.innerHTML = value;
}
  this.value_name(value);
}

function slider_value2(value) {

var slider = document.getElementById("myRange2");
var output = document.getElementById("demo2");

output.innerHTML = slider.value;

slider2.oninput2 = function () {
output.innerHTML = value;
}
  this.value_name(value);
}

// method used to change name according to slider value

function value_name(value) {

  var count = document.getElementById("myRange");

  
  if (parseInt(value) == 50000) {
 alert("I am 50,000");
  }
  else {

  }
}

<section <?php theme_section_attr_id() ?>
  <?php theme_section_attr_class( 'pb-5' ) ?>>
  <div class="container">
    <div class="row pt-5">
      <div class="col-md-8 showdow">
        <div class="row p-5 pb-0">
          <div class="pb-5">
            <p class="m-0 p-0"><strong>Number of Employees <span id="demo" style="float: inline-end;color: #00AFAB;"></span></strong></p>
            <div class="slidecontainer">
                      <p class="m-0 p-0"><strong>Number of Employees <span id="demo" style="float: inline-end;color: #00AFAB;"></span></strong></p>
                      <div class="slidecontainer">
  <input
  id="myRange"
  type="range"
  min="50"
  max="50000"
  value="50"
  class="slider no_emp" 
  oninput="slider_value(this.value)" 
  onchange="slider_value(this.value)">

</div>
  <p class="m-0 p-0">50 <span  style="float: inline-end;">50,000</span></p>
  </div>
<div>
            <p class="m-0 p-0"><strong>Monthly Investigations <span id="demo2" style="float: inline-end;color: #00AFAB;"></span></strong></p>
            <div class="slidecontainer">
              <input
              id="month_inv"
              type="range"
              min="10"
              max="1000"
              value="10"
              class="slider"
              oninput="slider_value2(this.value)" 
              onchange="slider_value2(this.value)">
            </div>
              <p class="m-0 p-0">10 <span  style="float: inline-end;">1,000</span></p>
          </div>
</section>