Strimmers, hedgecutters, blowers and saws all vibrate, and the law (the Control of Vibration at Work Regulations) says you must know how much of it each person gets in a day. SwardOps works it out from the record you already keep: every task timer names the kit in use.
Set it up. On each vibrating machine's page, enter Vibration (m/s²) — the manufacturer's declared figure from the manual or spec sheet — and whether it is declared or measured in use. Leave the field blank on mowers, vans and anything that isn't a hand-held vibrating tool. Then turn on Hand-arm vibration (HAVS) exposure in Settings → Features.
What the crew see. A line above the tasks on every job: Vibration today: 38 pts · share the vibrating kit round the team. It moves while a timer runs. The crew are never shown thresholds or countdowns — the aim is swapping, not alarm. When someone picks up a vibrating tool and a teammate has had less of it that day, the app suggests a swap for that task. At 100 points (HSE's exposure action value) the line turns amber and says they've done a fair stint and should swap for the rest. At 400 points (the exposure limit value, which must not be exceeded) it turns red and vibrating kit is greyed out for the rest of the day with "done for today" — the office sees the thresholds and the numbers in the register; the crew just see who should take the next turn. Who else is told: at 100 points everyone else clocked onto that job gets a push naming the person, the kit and the task — "can you take over for the rest?" — once per person per day. At 400 points the office is notified, not the crew: the person's own screen locks the vibrating kit, and the office makes the plan for the rest of the work before anyone on site is told anything.
What the office sees. Reports → Hand-arm vibration is the register: each person's days, hours on vibrating kit, points, worst day and days over each threshold, plus who carries the vibrating hours in each crew — a crew is flagged when one person has 70% or more of them. Two gaps are shown honestly rather than as zero exposure: hours on kit that has no figure yet, and hours timed with no kit logged.
The maths is HSE's own points system (L140): points = 2 × magnitude² × hours, summed over the day. Declared figures are usually lower than real in-use vibration, so HSE advises adding a margin or measuring; a measured figure can be entered instead.