Mouse tester

The big number is how many buttons went down and came up without any bounce. A plain mouse with three buttons reads three; one with side buttons can read five. A button that stays dark when you press it sent nothing to the browser, which can mean a worn switch, a mouse that is not fully connected, or a button that a driver gives another job.

A bounce is a press that arrives almost at once after the button last moved. A worn switch can do it, and then one click acts as two: a file opens when you only wanted to select it, or a game fires twice. Two fingers taking turns on one button very fast look the same, so this page calls it a possible bounce and never a fault. Run the test again, with slow single clicks, before you decide. When you make a double click, the result also sets your quickest pair beside a reference fact: by default, Windows counts two clicks as one double click when they come within 500 ms (as the documentation states it)^[1] of each other^[1].

While the test is on, the page listens for button and wheel events that come from your own hand and ignores those a script makes. It stops each button from doing its usual job, so that the right button does not open a menu and the wheel does not scroll the page. Some browsers still let the back and forward buttons leave the page; if yours does, the test cannot help it.

A press on the Done button is not counted, because it is not a press of the mouse under test. The wheel counts one step for each event the browser sends, which is a notch on most wheels and many small steps on a free-spinning wheel or a touchpad. Your result is kept in this browser only; you can read about us to see who makes the site.

• Press it again, firmly and in the middle, to rule out a slip.
• Try a different port or a fresh battery: a weak connection makes buttons drop out.
• Close the mouse software of the maker, which can give a button another job.
• Clean around the button with a soft brush or compressed air, since dust can keep a switch from closing.
• Try the mouse on another computer to find out whether the mouse or the computer is at fault.

The switch under a mouse button wears out. When its contact starts to bounce, it can close twice for one press, and a single click becomes a double click. It most often shows in the left button, which is used the most. Clicking slowly on this page shows whether the bounce is there every time. Many mouse makers repair or replace a mouse under guarantee, and the switch can often be replaced if you are able to solder.