It was a Tuesday in March 2022 when I made my most avoidable purchase of the year: a small brown box, a Fujifilm logo, and a battery that didn't fit the camera it was supposed to power.

The box cost me $62. The lesson cost me nothing extra—I just had to admit I'd skipped a page of the manual.

I'm the operations coordinator at a specialty clinic in Ohio. I've been handling equipment and supply orders for six years. I've personally made—and documented—eleven significant purchasing mistakes, totaling roughly $9,000 in wasted budget. Now I maintain our team's procurement checklist to prevent others from repeating my errors. Three of those mistakes had the same root cause: assumption.

Mistake #1: The Fujifilm battery that didn't fit

Earlier that month I'd picked up a secondhand Fujifilm X100F for documenting equipment conditions and clinic spaces. It's a niche choice, but reading Fujifilm X100F digital camera reviews kept pointing to the same strengths: a sharp fixed lens, lovely color, and controls that don't require a class to operate. (Surprise, surprise: the reviews were right about the camera.)

What the reviews didn't cover was which spare battery to buy. I went online, saw a "Fujifilm NP-W235 battery" at a good price, and assumed it would fit. The NP-W235 is a perfectly good battery—for the X-T4 and X-T5, not for the X100F. The X100F, released in 2017, takes the NP-W126. The difference isn't subtle: the W235 is physically larger and wouldn't slide into the compartment no matter how I angled it.

Back at my desk, I checked the camera manual. Page 103: NP-W126. It had been there the whole time.

Afterward, I looked at the FTC's advertising guidelines. They're a reasonable reference: claims like "compatible with X100F" need to be truthful and substantiated (ftc.gov/business-guidance). But the point isn't to point fingers at the seller. It's to recognize that I trusted the product title more than the manufacturer's official specification.

That $62 came back, minus restocking. The real cost was the rule I added to my process: verify part numbers against the manufacturer's documentation, not against the words in a marketplace listing.

Mistake #2: The patient monitor that wouldn't mount

Six months later, in September 2022, I repeated the mistake with a higher price tag.

We were upgrading two exam rooms with refurbished patient monitors. I did the research on the things I thought mattered: vital-sign parameters, display size, battery backup, warranty. The unit checked every box.

What I didn't check was the mounting pattern on the back. I'd assumed our existing wall arms would hold the new units, because in my head "standard mount" was the same pattern for every manufacturer. It isn't.

Delivery day was humbling. The technician unboxed the first monitor, held it up to the wall arm, and gave me a look I've learned to recognize. The gap was about 1.5 centimeters. One and a half centimeters between the adapter holes and the wall mount.

We found a local fabricator to machine adapter plates: $430 and eleven days, during which one of the monitors sat on a cart like a very expensive tablet.

The supplier wasn't the villain. Had I asked for the installation drawing, they'd have sent it before I paid. I just didn't ask. The lesson: dimensions are not optional. Request the mounting drawing, clearance requirements, and power data before you pay.

Mistake #3: The power wheelchair that didn't fit through the door

Then came the power wheelchair.

Our building houses a dental clinic and a small rehab practice on the same floor. We'd received a grant to improve access, and I was tasked with getting a powered transport chair for patients moving between the waiting room, the imaging suite, and the consultation rooms.

I did everything right on paper: 350 lb load rating, 20-mile range, folding seat. I compared one model after another. In June 2023, I placed the order.

The unit arrived a week later. The delivery driver and I unwrapped it in the corridor. Then I discovered the door to the imaging suite was 26.5 inches wide—and the wheelchair was 28.5 inches. I'd never measured the door. I'd measured everything except the space it had to pass through.

A two-inch miscalculation cost us $3,400 in freight, restocking fees, and delay. The vendor was professional about it. They didn't have to be; it wasn't their job to know our hallway.

Here's what still stings: I'd spent weeks comparing rows in spreadsheets and never once asked, "Will this physically fit through the building?" Specifications tell you what a product can do. They don't tell you whether it can get to your room.

The conversation that almost became mistake #4

In January 2024, a patient's mother asked me about the types of orthodontic appliances her twelve-year-old might need before starting braces. She wasn't asking for a diagnosis—she wanted help understanding terms like fixed braces, clear aligners, retainers, functional appliances, and palatal expanders. I knew the textbook definitions.

I also knew, from my own track record, that knowing a name isn't the same as knowing how to use it. This gets into clinical territory, which isn't my expertise. The safe move was to bring in the orthodontist.

She did what I couldn't: she reviewed the patient's images on our Fujifilm imaging system, explained why an expander needed to come first, and scheduled the braces for later. No brochure could produce that answer. It reminded me that a good procurement checklist has one more line: know where your expertise ends, and get the right person to answer clinical questions.

What changed: the checklist

After the wheelchair incident, I wrote a pre-purchase checklist for anything above $500:

  • Verify part numbers and compatibility against the manufacturer's manual—not a third-party listing.
  • Request the installation drawing or dimensional sheet before paying.
  • Physically measure every door, elevator, and corridor on the delivery path.
  • If the device affects patient care, have a clinician confirm it fits the intended use.

In the eighteen months since, our team has caught 47 potential errors with that checklist (as of January 2025, at least). Wrong SKUs, mismatched accessories, undersized doorways. Some were small. A few could have wiped out the year's supplies budget.

Look, I'm not saying you should avoid a discounted Fujifilm battery or a refurbished patient monitor. I'm saying the product title is the start of the research, not the end.

The three episodes cost roughly $4,000—no, $3,900, I'm mixing it up with an electrician's invoice from the same renovation. Close enough that I had to open the spreadsheet to be sure.

An informed customer asks better questions and makes faster decisions. I'd rather spend fifteen minutes verifying compatibility than fifteen days waiting for a return label.

That's the checklist I live by now. I hope you use it before we have to.