> ## Documentation Index > Fetch the complete documentation index at: https://docs.assetinfinity.ai/llms.txt > Use this file to discover all available pages before exploring further. # Tools and instruments > The tool register, what decides whether a tool can be issued, and why calibration is treated separately. Torque wrenches, gauges, thermal cameras, vibration meters — the equipment technicians take to a job, as opposed to the parts they leave behind. The tool register ## Can it be issued? Two different things decide, on two different records: * The **status** says whether the tool is available for booking. * The **condition** says whether it is safe to use. A tool can be *Available* by status and *Damaged* by condition. Only the pair answers the question, so the list leads with **the answer** rather than with the two inputs and a reader who has to combine them. Configure both lists under [tool settings](/config/tools). ## Calibration The other thing that stops a tool being usable, and it is worse than unavailable. An overdue instrument still works. It still gives a reading. That reading is simply no longer evidence — which means work already signed off on it is in question, not just work still to come. Each tool shows when it was last calibrated, when it is next due, and whether it is overdue. Overdue tools raise a [notification](/config/notifications) and appear as a shortage on the [readiness](/work/work-order-detail) of any job requiring them. Record a calibration on the tool to reset the clock. The history is kept, because "when was this last calibrated" is an audit question. ## Issuing a tool Tools are taken out against a job. The register shows what is out, to whom, on which work order, and since when. A job that needs an instrument carries it as a **requirement**, so: * Readiness warns if it is unavailable, damaged or out of calibration. * Dispatch warns before you send somebody without it. * The tool cannot be quietly double-booked across two jobs at once. ## Adding a tool **New** on this screen. A tool needs a number, a name, a type and a category, plus its calibration interval if it is an instrument that needs one. ## Rented tools Where a tool is hired rather than owned, record the vendor and the hire period so the cost lands on the job. ## Related topics - [Tool settings](/config/tools.md) - [Inside a work order](/work/work-order-detail.md) - [Working a job](/field/job.md) - [Notifications](/config/notifications.md) - [The dispatch board](/work/dispatch.md)