Every lab has one: the pH meter that belongs to bench 4 but lives wherever it was last used. Multiply that by balances, hotplates, centrifuges and a shared incubator, and “where is it?” becomes the most-asked question in the building. Lab equipment is rarely stolen - it is absorbed, into the next room, the other team, a drawer. This guide is a system for getting it back: one record per instrument, labels that survive solvents and gloves, a check-out habit that works at the bench, and calibration records that live with the instrument.
What you will learn
- Why lab equipment drifts
- One record per instrument
- Labels that survive the lab
- Check-outs between rooms and teams
- Calibration and maintenance records
- Tools that make this easier
- FAQ
Why lab equipment drifts
Lab kit has failure modes all of its own:
- Identical instruments are interchangeable until they aren’t. Five balances look the same; only one was calibrated last month. Without per-unit identity, the wrong one gets used and nobody knows.
- The “working one” effect. Everyone migrates to the instrument that behaves, it gets carried everywhere, and the rest decay quietly in corners.
- Rotating people, permanent equipment. Students, postdocs and contract staff cycle through; the knowledge of what lives where leaves with each of them.
- Pre-deadline hoarding. Ahead of a busy period, shared kit gets squirrelled onto private benches “just in case”, and the common pool empties.
- Off-site calibration is a black hole. An instrument sent away for service is indistinguishable from a missing one unless its status says so.
One record per instrument
The register is what turns “a balance” into a specific, accountable unit. Per instrument:
| Field | Why it matters |
|---|---|
| Asset ID | The label’s short code - what gets quoted at the bench |
| Instrument type + model | Separates the analytical balance from the toploader at a glance |
| Serial number | Ties the unit to its calibration certificates and service contract |
| Home location | Room and bench it returns to by default - the anchor for everything |
| Responsible team or person | Shared kit still needs a name on it for questions and budgets |
| Status | In use, in storage, in repair, retired - “away for calibration” is a status, not a mystery |
| Calibration due date | The field that decides whether results from this unit can be trusted |
| Last service | Context for the next fault: pattern or one-off |
| Purchase date + warranty end | Repair-or-replace maths, and free repairs you would otherwise pay for |
| Documents | Calibration certificates, manuals, service reports on the record itself |
If your lab runs teaching sets of optical instruments, those have their own quirks - the microscope tracking guide covers them separately.
Labels that survive the lab
A lab is hostile territory for labels: solvents, gloves, heat, daily wipe-downs. The practical rules:
- Chemical-resistant synthetic stock - laminated polyester at minimum. Paper labels in a lab are a one-month experiment.
- On the body, not the removable parts. A label on a lid or door tracks the lid. Never inside a working chamber, never on a heated surface.
- Clear of wash-down and handling zones, so gloved hands and disinfectant get less chance to lift it.
- Small items take small measures. Pipettes get a slim wrap label; otherwise label the stand, case or charging dock and keep the unit’s serial in the register.
- QR plus printed ID. The QR code scanned with a phone camera opens the instrument’s record at the bench; the printed code works when hands are full or gloves make phones awkward.
Check-outs between rooms and teams
The traditional fix is a sign-out book, and it fails for one reason: the book lives in one room and the borrowing happens in another. The habit that actually survives is scan-to-borrow - the label on the instrument is the sign-out sheet, wherever the instrument happens to be.
Keep the model simple: every instrument is either at its home location or checked out to a named person, with a due date for anything in demand. Instruments leaving the building - field work, another site, off-site calibration - get checked out exactly the same way, to a person or to the service company. The open check-out list replaces the group-chat archaeology, and the overdue list tells you which borrows have quietly become ownership.
Tip: when an instrument fails calibration or starts behaving oddly, change its status before anything else - before the email, before the repair quote. An out-of-calibration instrument that still looks available will be used, and the cost of that is not the instrument, it is every result it produces.
Calibration and maintenance records
Location tracking tells you where an instrument is; calibration and service records tell you whether it is worth walking over to. Hold a due date for every instrument that needs periodic calibration or inspection, build the inspection schedule from the register rather than memory, and attach each certificate to the instrument’s record so audit day is a filter, not a folder hunt.
Plan around the lab’s rhythm: clustering calibrations into quiet periods turns instrument downtime from a crisis into a calendar entry. And record repairs against the unit - a centrifuge on its third bearing failure is telling you something a maintenance folder never would.
Tools that make this easier
The standard lab inventory is a spreadsheet maintained by one diligent person, and it works right up until that person’s contract ends. Sheets also fail structurally: they hold one current state, so the history of who borrowed what, when the balance was last calibrated, and which repairs preceded this fault all live somewhere else - or nowhere.
AMPthilly puts it on the instrument’s record instead: profiles with serial, status, location and custom fields per asset type (a calibration due date, for instance), with certificates and manuals attached; printable QR labels that open the record in any phone browser at the bench, no app install; check-outs and returns logged as events with due dates and an overdue list; issue reports with photos that stay on the instrument permanently; and a filterable audit history of all of it. The free plan covers 3 users and 25 assets - one shared-equipment room, tracked properly, before any money changes hands. Details on the pricing page.
FAQ
How do you keep track of lab equipment? One register, one chemical-resistant label per instrument, a home location for everything, and a scan-to-borrow check-out habit for anything that moves.
What should a lab equipment inventory include? Asset ID, type and model, serial, home location, responsible team, status, calibration due date, last service, purchase and warranty dates, and attached certificates.
What labels survive lab conditions? Laminated polyester or chemical-resistant synthetics, placed on the instrument body away from heat, wash-down zones and removable parts.
How do you manage equipment shared between teams? Home locations plus a borrow log. Default position is the home bench; anything elsewhere is checked out to a named person with a due date.
How should calibration records be kept? Against the instrument, with date, result, certificate and next-due date - and an immediate status change for anything that fails.
The takeaway
Lab equipment drifts because it is shared, identical and surrounded by people who rotate out. Counter all three: give each instrument an identity and a home bench, label it for the chemistry around it, make borrowing a ten-second scan, and keep calibration history on the unit itself. The lab that does this stops asking “where is it?” and starts asking better questions.