$(".polzunok-2").slider({
min: 0,
max: 500,
value: 200,
range: "min",
animate: "fast",
slide : function(event, ui) {
$(".polzunok-2 span").html("<b><</b>" + ui.value + "<b>></b>");
}
});
<div id="slider"></div>
<div id="value"></div>const min = 100;
const max = 500;
$('#slider').slider({
min,
max,
value: min + Math.random() * (max - min) | 0,
range: 'min',
animate: 'fast',
slide: (e, ui) => $('#value').html(max - ui.value + min),
});