e-ProForm Extend
Replace numbers with a range slider
Slider Number Field Extension
Use Range
On Number Field type, if you set Min and Max Value, then an extra switcher will be available in the Form > Content > Form Fields > Your Field > e-addons Tab.
This will automatically replace the numeric input into a range slider input.
DEMO
Slider Extension
Any Number Field with a Min and Max value can be transformed in a Slider, natively supported by all browsers