Single-click the pad as you would in normal use. Every gap between presses is logged. Anything under 50 ms is almost certainly a worn switch — not your finger.
The 50 ms threshold is the rule of thumb used by Logitech / Razer for chatter detection. A healthy switch produces gaps in the 80–250 ms range during fast clicking.
Inside every mouse switch is a pair of metal contacts that close when you press. Over millions of cycles those contacts oxidise, deform, or pick up debris, so a single press briefly opens and closes again as the contact bounces. The PC sees two distinct mousedown events a few milliseconds apart and interprets them as a double-click. This is mechanical wear, not software, and reflashing firmware will not fix it — only the switch itself, by resoldering or by adjusting the firmware debounce time, will.
Run this test for at least 30 normal clicks. If under-50 ms intervals appear on the same button repeatedly, it is the switch. Then cross-check by opening Control Panel → Mouse and lowering the double-click speed slider; if doubles persist at the slowest setting, software is ruled out. Also try the mouse on a second machine. Chatter that follows the device across PCs is conclusive. Chatter that disappears on a fresh user account points to a driver or vendor-software macro instead.
Three practical options. First, increase the firmware debounce time in your vendor software (Razer Synapse, Logitech G Hub, Glorious Core all expose this) — values of 8 or 16 ms cure most early-stage chatter at the cost of marginal extra latency. Second, contact-clean the switch by spraying isopropyl alcohol through the actuator and rapidly clicking 50 times. Third, swap the switch with a soldering iron; pre-soldered hot-swap mice make this trivial. Replacement is the only permanent fix.
Windows defaults its double-click speed to a 500 ms maximum gap with a typical user landing around 200–300 ms. A trained fast clicker manages 80–120 ms. Anything under 50 ms is below human reaction-cycle minimums and is treated by this tool as chatter. Note that the threshold is between two presses on the same button — different-button presses are unrelated. The /mouse/buttons tool tracks all five buttons separately if you want a broader picture.
Chatter is the symptom of an aging switch, not a cause of further damage. Once symptoms start, the failure rate accelerates because the oxidation layer on the contacts grows under each arc. Most Omron D2F-01F switches are rated for 20 million clicks and chatter typically begins between 5 and 15 million, depending on click force and humidity. Kailh GM 8.0 and Huano Blue Shell often run longer. Lighter-actuation 30 g switches usually outlast 75 g switches in real-world use.
It will register taps, but precision tapping is not the same as mechanical switch wear, so a flagged interval on a trackpad does not necessarily mean broken hardware. Trackpads handle their own debounce in firmware and rarely chatter. If a trackpad triggers chatter flags, suspect palm-rejection or driver issues first, not the sensor. For real switch diagnostics, attach an external mouse before running this test.