Logitech G305 Lightspeed Tester
Click any button to test it — with double-click bug detection, scroll and sensor checks.
Left: 0
Middle: 0
Right: 0
Back (4): 0
Forward (5): 0
Scroll ↑: 0
Scroll ↓: 0
Click, scroll and hold buttons inside this panel. Right-click menu is suppressed here.
Sensor tracking
Draw slow circles — gaps or straight jumps in the line reveal sensor skipping.
Double-click detector
Any second click within 80ms of the last one is flagged — real human double-clicks are slower. Flags: 0
How it works
The G305 brought esports-grade wireless to a budget price by running on a single AA battery — which is also the key to diagnosing it: a huge share of 'broken G305' reports are actually voltage sag from a dying or cheap battery. Test it here with a fresh alkaline or NiMH before condemning the hardware.
Logitech G305 Lightspeed at a glance
| Released | 2018 |
|---|---|
| Connection | LIGHTSPEED 2.4GHz wireless (USB-A receiver), 1×AA battery |
| Weight | 99g (with AA battery) |
| Sensor | HERO 12K optical |
| Main switches | Omron mechanical |
| Polling rate | 1000Hz |
Known issues on the Logitech G305 Lightspeed
Low battery causes input drops, stutter and even phantom disconnects long before the software battery meter reads empty. The battery door and post can crack if the mouse is dropped. Being an Omron-switch Logitech, the double-click fault appears with age, though later production batches improved. The receiver suffers the usual USB 3.0 interference.
Work through the tester above: click every button and watch its counter, scroll both directions one detent at a time, hold your normal clicking rhythm on the main buttons to bait out double-click bounce, and draw slow circles on the canvas to expose sensor or link dropouts. Want to verify the reported rate too? Run the polling rate test, and test sustained clicking with the click speed test.
Diagnosing your mouse
Click each button, roll the wheel and move the pointer inside the arena; every button, scroll step and the double-click detector report live. Because the test reads raw browser events, it separates a genuine hardware fault from a software quirk — the difference between "my mouse is broken" and "my mouse software remapped a button".
The double-click bug
A worn micro-switch "bounces", sending two clicks for one physical press. The detector flags any second click landing within 80 ms of the first — far faster than any human double-click. Repeated flags on single presses mean switch bounce: a real hardware fault. Contact cleaner sometimes buys time; otherwise the switch needs replacing. This same bounce silently inflates scores on the click test, so verify here first.
Button and scroll issues
| Symptom | Cause | Fix |
|---|---|---|
| Side buttons 4/5 don't register | Browser support varies; driver mapped them to Back/Forward | Disable gestures in the mouse software, re-test |
| Right-click opens a menu | Context menu stole focus | Click once inside the arena first |
| Scroll skips or reverses steps | Failing wheel encoder | Clean the wheel; a worn encoder needs replacing |
| One physical click = two counts | Switch bounce (double-click bug) | Contact cleaner or switch replacement |
Sensor and tracking
Move the pointer smoothly across the arena. Jumps, stutters or a cursor that won't reach the edges point to a dirty sensor lens, a bad surface (glossy or glass), or a failing sensor. Wipe the lens, try a proper mousepad, and re-test before blaming the hardware.
Troubleshooting
› Right-click opens a menu instead of registering
The test arena suppresses the context menu while your pointer is inside it. If a menu still opens, click once inside the arena first so it has focus.
› Buttons 4 and 5 don’t register
Browser support for side buttons varies, and some mice map them to Back/Forward at driver level. Try disabling gestures in your mouse software, then test again.
› The double-click detector flagged my mouse — now what?
Repeated flags on a single physical click mean switch bounce, a hardware fault. Cleaning with contact cleaner sometimes helps; otherwise the switch needs replacing.
Frequently asked questions
› Which mouse buttons can I test?
Left, right, middle (wheel click), and side buttons 4 and 5, plus scroll up/down and pointer tracking.
› What is the double-click bug?
A worn switch “bounces”, sending two clicks for one press. Our detector flags any second click that lands within 80ms of the previous one — far faster than a human double-click.
› Can I test my scroll wheel?
Yes — scroll inside the arena and watch the up/down counters. Skipped or reversed steps indicate a failing wheel encoder.
› Is my mouse data private?
Completely. All events are processed in your browser; nothing is recorded or uploaded.
Common Logitech G305 Lightspeed problems and how to read them
These are the faults owners report most for the Logitech G305 Lightspeed, what causes each, and how to confirm it with the tester above before spending money on a repair or replacement.
| Symptom | Cause | What to do |
|---|---|---|
| Cursor freezes for half a second randomly | Battery voltage sag or receiver interference | Swap in a fresh battery and move the receiver to a front port, then redraw circles on the canvas — if the line is now continuous, it was never the mouse |
| Double-click flags on the left button | Aging Omron switch, the familiar Logitech pattern | Warranty if recent; otherwise the G305 opens easily and takes standard D2F switches — one of the cheapest mice to repair |
| Mouse won't wake after idle | Aggressive power saving plus a weak battery | Click and wait a full second; if it needs a battery reseat to wake, replace the battery before suspecting the PCB |
Testing tip: Keep one known-good NiMH battery just for testing — it turns G305 diagnosis from guesswork into a two-minute check.
If it's beyond saving: consider the Logitech G Pro X Superlight — the step up when you outgrow AA batteries and want 40 fewer grams.
Recommended replacements
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