Equipment Verification Checklist: Hexagon Logo, Pipette Tip Compatibility, 112 Multimeter, and Mitutoyo Micrometer Calibration

I'm a quality and brand compliance manager at an instrumentation distribution company. I review every piece of test and measurement equipment before it reaches a customer — roughly 200 items a month. In Q1 2025 I rejected 12% of first deliveries because the documentation didn't match the device, the calibration data was missing, or the accessory fit hadn't been verified. This checklist is what I actually use.

It's for anyone about to put new or repaired equipment into service: a micrometer, a multimeter, a pipette, even a CMM. There are six steps, and each one ends with a pass/fail check point. The temperature part in Step 3 is the one almost everyone ignores.

When to Use This Checklist

Use this before you trust a supplier's certificate:

• New equipment arrives with a certificate but no test data.
• After a repair or a suspected drift.
• When mixing pipette brands and tips in the same lab.
• Before an annual audit or ISO/IEC 17025:2017 assessment.
• When something feels off during routine use.

Step 1: Verify the Brand Identity, Including the Hexagon Logo

Start with the instrument itself, not the box. Check the nameplate, model number, and serial number. On a Hexagon CMM or laser tracker, verify the Hexagon logo: letter spacing, the hexagonal mark, and the serial number format. A counterfeit or gray-market unit often has a slightly off logo, a missing revision digit, or a nameplate that contradicts the packing slip.

Most manufacturers, including Hexagon, let you check serial numbers online. If the serial doesn't return a match, treat it as a red flag. I had a supplier once try to pass a reconditioned unit as new — the logo was correct, but the serial had been re-stamped.

Pass: logo, model, and serial match the certificate and manufacturer records. Fail: any mismatch, re-stamp, or missing revision.

Step 2: Pipette Tip Compatibility Check

Pipette tips are the classic 'small part, big problem.' A tip that doesn't seal properly changes the delivered volume, even if the pipette was calibrated yesterday. In our lab we use ISO 8655-2:2022 as the baseline. It's not just about the pipette; it's about the whole system with the tip.

For pipette tips compatibility, check the tip cone angle, diameter, and volume range. A 10 µL tip on a pipette designed for 200 µL will feel loose. A 200 µL tip on a 100 µL pipette might seal visually but fail gravimetric testing.

The surprise wasn't the price difference between OEM and generic tips. It was how much variability came from a tip that clicked into place but didn't actually seal. A visual check isn't enough.

Pass: tip seals, fits the volume range, and passes a gravimetric check. Fail: wobble, leakage, or poor repeatability.

Step 3: How to Calibrate a Mitutoyo Micrometer

The question 'how to calibrate a Mitutoyo micrometer' comes up a lot. Here's the routine:

1. Let the micrometer and gauge blocks sit in a 20 °C room for at least one hour. Two hours if the equipment came from a cold vehicle.
2. Clean the anvil, spindle, and gauge blocks with a lint-free cloth.
3. Close the spindle on an appropriate gauge block — for a 25–50 mm micrometer, use a 25 mm standard. Use the ratchet, not your grip.
4. Read the sleeve and thimble and record the value.
5. Repeat at five points across the range: near zero, 25%, 50%, 75%, and near max.
6. Compare each reading with the manufacturer's tolerance. If it's outside, attempt a zero adjustment or send it to an accredited calibration lab.
7. Document every reading with the gauge block ID and the uncertainty value.

The step most people ignore is temperature stabilization. I did too. In Q1 2024 I watched a technician try to calibrate a micrometer five minutes after it came out of a van sitting in the sun. The readings were off by almost 0.005 mm, and the instrument wasn't at fault. The 'new tool needs no warm-up' thinking comes from an era when tolerances were looser. That's changed.

There's something satisfying about closing a micrometer on a 25 mm gauge block and seeing 25.000 mm after adjustment. It makes the paper trail worth it. If you need a reference standard, ASME B89.1.13-2013 covers calibration of outside micrometers.

Pass: all points within tolerance. Fail: any point outside the manufacturer's limit.

Step 4: Functional Verification of a 112 Multimeter

A Fluke 112 multimeter is one of the better handheld meters, but even a good meter can drift or hide a fuse issue. For incoming verification, I do this:

1. Inspect the leads and input jacks for damage.
2. Check the fuse by using continuity mode with a known short.
3. Apply known reference values from a calibrator for DC voltage, AC voltage, and resistance.
4. Compare each reading against the accuracy table in the manual.
5. Record the actual readings, not just 'pass.'

Most people skip the fuse check. A meter with a blown fuse may display zero on current readings, and if you don't test that function with a known source, you'll never notice until it's too late.

Pass: all readings within the accuracy table. Fail: anything outside.

Step 5: Documentation and Pass/Fail Decision

Create a record that includes date, operator, device ID, standards used, environmental conditions, readings, and the final decision. The certificate is a claim; the data is proof.

We once received a batch of twelve micrometers where the zero point was visibly off. The vendor claimed it was 'within industry standard.' We rejected the entire batch and sent it back. They redid all twelve at their own cost. Now every purchase order includes a clause about calibration data acceptance.

If your lab isn't ISO/IEC 17025:2017 accredited, send critical instruments to one. The checklist gets the instrument into service; the accredited lab gives it legal traceability.

Pass: record is complete and traceable. Fail: missing certificate, no data, or serial mismatch.

Step 6: Label, Register, and Communicate

After a pass, attach a calibration label with the due date, update the asset register, and notify the people using the instrument. If it failed, quarantine it and make sure nobody can grab it by mistake.

Pass: label, register, and notification done. Fail: unlabeled instrument in service.

Common Mistakes I Still Catch

• Calibrating before the instrument reaches 20 °C.
• Using dirty or damaged gauge blocks.
• Assuming 'new' means 'calibrated.' It doesn't.
• Testing one pipette tip and assuming the whole box is good. Test each lot.
• Ignoring nameplate details on high-ticket items like CMMs. A Hexagon logo that looks almost right isn't right.
• Verifying a 112 multimeter without checking the leads and fuses.
• Skipping the serial-number match between the certificate and the instrument.

Bottom line: verify before you trust. That's not cynicism; it's quality. And here's the honest part: I don't expect this checklist to replace an accredited calibration lab. If your equipment needs legal traceability, send it to a lab with ISO/IEC 17025:2017 scope. For us, this checklist is the first gate, not the final answer.

In supplier reviews, I'd rather work with a calibration lab that tells me what they can't do than one that promises everything. The vendor who said 'this isn't our strength, here's who does it better' earned my trust for everything else.