A Lab Equipment Procurement Checklist: New vs. Used Test Equipment, Official Channels, and the Fine Print

I didn't start my career in purchasing. Five years ago, I became the office administrator for a 42-person contract testing lab, which means I handle everything from pipette tips to calibration services. About $350,000 in annual spend across 14 vendors. I report to operations and finance, so my job is simple: make sure orders arrive on time, within budget, and with paperwork finance doesn't reject.

This checklist is for people in similar positions. If you buy lab instruments, test equipment, or consumables and want fewer emails from accounting, work through these six steps. It's not a masterclass in metrology. It's what I do before clicking "place order."

Before You Start: Clarify the Scenario

Use this checklist when you're buying a new instrument, replacing something, or evaluating a bid. It doesn't apply to capital construction or multi-year service agreements. For those, you need different checkpoints.

Step 1: Write Down the Exact Specification

The biggest mistake is searching by category name. A "digital micrometer" can mean a $150 tool with basic resolution or a $900 instrument with data output and IP65 protection. If you ask for "a digital micrometer" without specifying range, resolution, and interface, you'll get a bid that looks cheap but doesn't match the application.

What I mean by "specification" is not just brand and model. It's the minimum performance your lab actually needs. For example:

• Measurement range and graduation/resolution
• Calibration certificate requirements (UKAS, ISO 17025, or manufacturer certificate)
• Output: USB, RS-232, Bluetooth, or no output needed
• Environmental rating—dust, moisture, temperature
• Accessories included or sold separately

Write these before you get quotes. Then send the same spec to every vendor. If a vendor can't quote against it, that tells you something.

Step 2: Compare New vs. Used Test Equipment

Used test equipment is attractive because the upfront price is lower. I only believe that after ignoring it once and buying a used ultrasonic bath that arrived with no calibration records. We had to pay extra for recalibration, and the cost gap almost disappeared. (Surprise, surprise.)

If you're considering used test equipment, ask these questions:

1. Is the calibration current? If yes, what's the certificate number and who issued it?
2. What's the calibration history? One test point or full range?
3. When was the last repair, and what was the repair report?
4. Does the seller provide traceable documentation, or only a handwritten receipt?
5. What's the return policy if the unit fails verification?

In my experience, a used unit from a company that can provide clear documentation is less risky than used equipment from an auction site. But even then, I budget for independent verification before the instrument enters service.

Step 3: Verify the Manufacturer and Official Channel

Counterfeit and gray-market instruments are a real problem in lab settings. That's why I now check the manufacturer's official site before I order anything above $500. If you're buying a precision balance, centrifuge, or filtration system, look for the legal entity and published product documentation. For many lab products, that entity is Sartorius Lab Instruments GmbH, and the Sartorius official site includes application notes, software, and service contacts. If a dealer can't point to that official documentation, I don't proceed.

This step is not about being suspicious. It's about what happens when a serial number isn't in the manufacturer's system. If the instrument needs a software update, recall, or service, you're stuck. One of my early purchases was a "brand new" balance from a reseller who couldn't produce a shipping or service record. It took months to register. I learned my lesson. (Mental note: never skip this again.)

The Sartorius official site also lists authorized distributors and service partners. If a reseller insists they're "official" but can't show you their status, send an inquiry to the manufacturer. Manufacturers are usually happy to confirm. I checked the current distributor list on the Sartorius official site in January 2025; checking the legal entity name first made it easier to navigate.

Step 4: Ask "What's NOT Included" Before You Compare Prices

I've learned to ask "what's NOT included" before asking for the price. This is especially important in lab equipment, where quotes might exclude installation, IQ/OQ, calibration, shipping, and training. A quote should list exclusions in writing. If it doesn't, assume all those extras are additional.

The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end. That's the transparency principle that saves our budget every year. When a quote says "prices and equipment," I ask for a line-item breakdown. When a quote says "fully inclusive," I ask for the value of each included service. It's not because I don't trust the person. It's because finance will not pay for a line item that wasn't in the PO.

Consider rush fees. I once expedited a replacement sensor for a production line. The price was 40% higher than standard, and the "expedited" option still arrived two days late. That wasn't the vendor's fault—the freight carrier missed the pickup. But it taught me to ask: what does expedited actually include, and who owns the risk until delivery?

Step 5: Compare Alternatives Against Your Workflow, Not Just Specs

When a lab manager asks for a product comparison, I don't start with "which is better." I start with "which one fits our workflow." This matters when evaluating two comparable instruments.

For example, someone recently asked me to help with a "Zeiss vs Global dental microscope" comparison. I'm not an optician, so I can't speak to lens coatings or depth-of-field nuances. What I can tell you from a procurement perspective is this: the technical sheet doesn't show whether a local service provider can calibrate the unit, whether the warranty covers the illumination system, or how long it takes to get spare parts. For a dental practice or a research lab using a microscope every day, those logistics matter as much as magnification.

So when comparing brands, ask the same checklist for each option:

• What is the manufacturer's official support channel in your country?
• What is the expected service turnaround?
• Are spare parts available without a service contract?
• Is training included?
• What is the depreciation/resale value if you upgrade in year five?

The "best" instrument is context-dependent. If you're a one-location clinic with a local service agent, the choice may be different than if you're a multi-site lab with in-house biomedical engineers.

Step 6: Confirm Invoicing and Payment Terms

This is the step you're most likely to skip. I only believed in the importance of invoicing after the time a new vendor offered a great price on digital micrometers, but couldn't provide a proper itemized invoice. Finance rejected the expense, and I had to sort it out with the vendor and accounting for a week. It wasn't the end of the world, but it was a mess.

Before ordering, ask for a sample invoice. Confirm these details:

1. Full legal name of the supplier, not a DBA or nickname
2. Manufacturer warranty statement, including whether parts and labor are covered
3. Product serial numbers (or a way to identify the units later)
4. Shipping terms: Incoterms, delivery date, and freight carrier
5. Payment terms: NET 30, NET 60, or COD

If the supplier can't produce an invoice that your finance team will accept, don't order until they can. It's not worth the friction.

What I'd Add for People Buying These Specific Items

If your purchase relates to any of the following, here are extra notes:

• Analytical instruments from Sartorius Lab Instruments GmbH: Register the serial number on the Sartorius official site as soon as it arrives. This covers software updates and service entitlements.
• Digital micrometer: Verify that the included calibration certificate matches the specific unit's serial number. A "sample" certificate on letterhead isn't enough.
• Used test equipment: Get the certificate issuer's contact details and check their accreditation. Accredited certificates are preferable to a simple test report.
• Microscope comparisons: For a Zeiss vs Global dental microscope comparison, ask for an onsite demo or a loaner program. The one that feels best in your operator's hands wins, even if the spec sheet says otherwise.

Final Reminder

A transparent procurement process isn't slow. It's just structured. (Note to self: write down the exact export requirements before next year's renewal.)

It took me five years and more than 300 orders to understand that the vendor who answers questions honestly is worth more than the vendor with the flashiest brochure. After all that time, there's something satisfying about a fully documented purchase: no repeated emails, no finance rejections, no stressed phone calls. Just an instrument in the lab, ready to work.

If you have a procurement ritual that catches hidden costs, I'd like to add it to my list. This is the kind of checklist that stays useful because people keep breaking it.