How to test a borrowed mouse before an esports match

A borrowed mouse can feel fine on the desktop and still cause trouble in a match. A side button may not register, the wheel may skip, or the mouse may use a different sensitivity than you expect.

Run a quick hardware check, then try the mouse in the game before the match starts. The Mouse Test checks buttons, the scroll wheel, double-clicks and polling rate. It cannot confirm your game settings or how the mouse feels during play, so include a short in-game test too.

Test the borrowed mouse

1. Open the Mouse Test on the computer you will use for the match. Connect the mouse with the same cable or wireless receiver you plan to use during play.
2. Click each mouse button, including the wheel button and side buttons if the mouse has them. Check that each press registers once in the test.
3. Scroll up and down through the test. Confirm that the wheel responds in both directions without skipping or scrolling when you are not touching it.
4. Use the double-click check to see whether a single press is being read as two clicks. Try a few ordinary clicks, not only rapid clicks.
5. Move the mouse as directed by the test to check its polling rate. Then open the game and try aiming, turning and using the buttons in a practice area or warmup mode.

Before testing, note which mouse you normally use and your usual in-game sensitivity. If you can, keep those settings unchanged until you know whether the borrowed mouse behaves as expected.

What the result means

Every button registers once

The buttons are sending input to the browser. This does not confirm that the game has the borrowed mouse's side buttons assigned to the actions you expect. Check those bindings in the game, especially if you use a side button for push-to-talk, melee or another time-sensitive action.

A click registers twice

The mouse may be double-clicking when you press once, or you may be clicking too quickly for the test's double-click check. Try several deliberate single clicks. If one press repeatedly appears as two, avoid relying on that button in the match and use a different working button if your controls allow it.

The scroll wheel skips or moves by itself

That points to an inconsistent wheel signal, a loose or dirty wheel, or an issue with the connection. A game may use the wheel for weapon selection, so test it in the game's controls as well. If you do not use the wheel during play, you may be able to work around the fault, but do not assume it is reliable.

The polling rate changes between movements

Polling rate is how often the mouse reports input to the computer. A browser measurement can vary with movement, the connection and how the computer schedules the page. Treat it as a quick check, not a precise measurement of in-game response time. A different reading alone does not prove that the mouse is faulty.

The browser test passes, but aiming feels wrong

The test confirms basic input, not your aim, tracking or game configuration. The borrowed mouse may have a different sensitivity setting, shape, weight or surface behavior. Make a few slow and fast turns in the practice area before deciding whether it is suitable.

How to fix it

1. Check the connection. For a wireless mouse, confirm that its receiver is connected and the mouse is switched on. If it uses Bluetooth, check that it is connected to this computer, not another nearby device. For a wired mouse, reconnect the cable without pulling on it.
2. Check the battery or charge. Replace or recharge a low battery if you can. If the mouse has a wired mode, use it only if the cable and mouse support that mode.
3. Use a stable surface. Put the mouse on a clean, opaque mouse pad or desk surface. Reflective, transparent or uneven surfaces can make tracking unreliable, even when the buttons pass the test.
4. Check the game's input settings. Confirm the mouse is selected if the game offers a device choice, and review sensitivity and button bindings. Do not copy a sensitivity number blindly if the borrowed mouse has a different DPI setting, which controls how far the pointer moves for a given physical movement.
5. Check the computer's mouse settings. On Windows 11, open Settings › Bluetooth & devices › Mouse to check pointer and scroll settings. On macOS, open System Settings › Mouse to check tracking and scrolling. These system settings may not affect games that read mouse input directly, so use the game's practice area to judge the result.
6. Reconnect it to another port. If clicks or movement still drop, try another USB port and repeat the test. For a wireless receiver, use a port close enough to keep the receiver unobstructed, without placing it where it could be knocked during play.

When to use a different mouse

If the same button repeatedly fails in the browser test and in the game, or a single click consistently registers twice, do not depend on that mouse for a match. Use a known working spare if one is available. A wireless mouse that repeatedly disconnects or loses tracking is also a poor choice, even if it works for a few minutes after reconnecting.

If you borrowed it from a teammate, tell them what failed rather than changing settings or opening the mouse. Hardware repairs and button assignments can wait until after the match. Before warmups, make only changes you can undo and test again.

Why the polling number is only a clue

A polling rate shown in a browser is not the same as a measurement of total input lag. The browser, operating system, connection and test method all affect the result. A higher number is not automatically better for every player or computer, and a quick test cannot tell you whether a sensor will feel comfortable during a full match.

For the final check, play for a few minutes with the actual game, mouse pad and settings you will use. That is the quickest way to notice an unexpected sensitivity, an awkward grip or a control that does not match your usual setup.