Direct comparison
Onsite vs Send-Out vs In-House Calibration
Onsite, send-out, and in-house calibration compared on cost, downtime, accreditation scope, and documentation, plus how to vet an onsite provider.
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How do Onsite / Mobile, Send-Out (Depot), In-House compare side by side?
The table below compares Onsite / Mobile, Send-Out (Depot), In-House across 9 procurement-relevant dimensions, from where it happens through best fit for.
Side-by-side comparison
| Dimension | Onsite / Mobile | Send-Out (Depot) | In-House |
|---|---|---|---|
| Where it happens | Technician travels to your facility; equipment calibrated in place | Equipment shipped or hand-delivered to the provider's own facility | Your own site, using internally-owned reference standards |
| Who performs it | Third-party technician, dispatched to you | Third-party lab staff at the provider's facility | Your own trained employees |
| Equipment downtime | Minimal — equipment stays in place, often same-day | Days to a few weeks (shipping + queue + return transit) | Minimal — scheduled at your own discretion |
| Typical equipment fit | Large, fixed, or hard-to-move equipment (balances on isolation tables, incubators, centrifuges, autoclaves, chambers) | Small, easily shipped instruments (pipettes, weight sets, thermometers), or work needing lab-controlled conditions | Equipment for which you hold the reference standards and documented staff competency, typically routine checks rather than full accredited calibration |
| Accreditation scope to verify | Confirm ISO/IEC 17025 scope explicitly lists field/on-site calibration for your instrument type and range, not just lab-based work | Confirm the provider's accreditation covers your instrument type/range at their accredited location | Usually not third-party accredited unless your own calibration function has itself pursued ISO/IEC 17025 accreditation |
| Turnaround time | Often single scheduled visit, same day for covered instruments | Typically days to a few weeks depending on provider backlog | Immediate, scheduled by you |
| Cost structure | Travel/trip charge plus per-instrument fee; economical when batching several due instruments in one visit | Per-instrument fee plus shipping/insurance; no travel charge | Upfront capital cost of reference standards plus staff time; no recurring per-visit vendor fee |
| Documentation delivered | Calibration certificate with as-found/as-left data, uncertainty, and traceability, per visit | Same certificate content, issued after work at the provider facility | Internal calibration record; an accredited certificate only if your own program is accredited |
| Best fit for | Multi-instrument sites wanting minimal downtime and consolidated visits | Small, shippable instruments or specialized parameters needing lab conditions | High instrument counts with frequent routine checks, where in-house capability is cost-justified |
Common questions
Common questions about Onsite / Mobile vs Send-Out (Depot) vs In-House
What is onsite calibration?
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Onsite calibration is a service model where a technician travels to your facility with portable reference standards and calibrates equipment in place, rather than removing it for shipment to a lab.
Is a mobile calibration service the same as onsite calibration?
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Effectively yes. "Mobile" tends to describe the provider bringing a traveling calibration capability (van or portable kit); "onsite" describes the outcome — the calibration happens at your location. Both refer to the same buying decision as opposed to send-out (depot) service.
What is a third-party calibration service, and how is it different from onsite calibration?
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"Third-party" describes who performs the calibration — an external provider rather than your own staff. "Onsite" describes where it happens. A third-party provider can deliver calibration either onsite at your facility or as a send-out service at their own lab; the two terms answer different questions.
How do I check that an onsite provider's accreditation actually covers field work?
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ISO/IEC 17025 accreditation is granted for specific instrument types, parameters, and locations. Search the accreditation body's public scope of accreditation (A2LA, ANAB, or NVLAP each publish searchable directories) and confirm field/on-site calibration is explicitly listed for the instrument type and range you need — accreditation for lab-based work doesn't automatically extend to onsite work.
Can all lab equipment be calibrated onsite?
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No. Equipment requiring tightly controlled environmental conditions, or calibration methods that depend on primary reference standards that can't travel, typically needs to be sent to the provider's own facility instead.
How much does onsite calibration cost compared to send-out?
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Onsite service typically adds a travel or trip charge on top of the per-instrument calibration fee, offset by minimal equipment downtime and the ability to batch multiple instruments into a single visit. Send-out service drops the travel charge but adds shipping/insurance costs and a longer unavailability window. The more economical option depends on how many instruments at one site are due at the same time.
