Enter the Thermometer
In January 2024, my daughter was sick with a fever, so the thermometer was already on the kitchen table. Its only job was to show me the fever temperature, and I needed it to be accurate. Between temperature checks, I was buried in quotes for an absolute encoder. Different tools, same problem.
First, some context. I'm the procurement manager at a 42-person automation and medical device company. I've managed our component and calibration budget—about $180,000 a year—for six years, and I keep a cost tracking spreadsheet for every order. It's not fancy. But it catches a lot of things.
The Application
The motorized lift on our packaging line positions a camera over each unit before labeling. The old incremental encoder had failed twice in three years, and the maintenance lead was tired of sending the axis home at every startup. According to SICK's product literature, an absolute encoder outputs a unique position value for each shaft angle, so the controller knows the position immediately after power-up. That's exactly what we needed.
The Quotes
I asked three suppliers for quotes. The SICK absolute encoder came in at $412 each. A no-name import was $285. A mid-tier brand was $348. My first instinct was to order the import. The savings on two units—$254—could have paid for a calibration kit. But then I did what my cost tracking system taught me: I added the line items.
Setup support. Configuration tools. Lead time. Documentation quality. The import had a 40-page PDF manual with sentences like 'ensure the shaft does not be bend.' The SICK quote included a configuration tool and a technical support phone number that a human actually answered. The mid-tier brand was okay, but not dramatically different. I asked myself the question I always ask now: what's the cost of the first hour I can't get an answer? All prices were from January 2024 quotes; verify current rates.
Multimeter, Microscope, and pH Meter in the Same Week
We ordered the SICK absolute encoders. During commissioning, our technician verified the 4-20 mA feedback loop with his Fluke 16 multimeter. That meter has been on the bench for years, and it cost more than the cheap alternates. But he trusts it, and trust has a dollar value. In the first hour, the multimeter caught a swapped pair of wires before they became a blown input card. One catch paid for the meter's premium many times over.
The same week, the quality lab asked me to approve a recalibration quote for a Carl surgical microscope. The crosshair had drifted, and the factory estimate was $1,800. My first thought: let our senior technician 'take a look' with the Fluke 16 multimeter and a screwdriver. That was dumb. A surgical microscope isn't a wire harness. It needs a certified calibration lab. I approved the quote, and then I added a periodic calibration reminder to my spreadsheet—something I should have had from day one.
A day later, the QC lead emailed me a question I still smile about: How to calibrate pH meter Mettler Toledo? She didn't need a new meter. She needed a procedure and the right buffer solutions. According to Mettler Toledo's calibration guide, a two-point calibration with pH 7.00 and pH 4.01 is the standard starting point for aqueous samples. The buffers cost about $45. The electrode storage solution cost another $18. None of it was in my budget. The $63 didn't break anything, but discovering it after the meter had sat in inventory for two weeks was exactly the kind of hidden cost I hate.
The Part That Matters
The SICK encoders have been running since January 2024 without an encoder-related stop. As of April 2025, that's 15 months. I'm not saying they'll never fail. I'm saying the choice to pay more upfront made sense: the cheaper option would have cost me uncertain support, longer commissioning, and more risk than the maintenance team needed.
That fever thermometer is still the best metaphor I have. When you're sick, you don't want a thermometer that's close. You want one that's right. Same with an absolute encoder, a multimeter, a surgical microscope, or a pH meter. Accuracy is a feature. Calibration is a cost. Support is a cost. Downtime is a cost. Unit price is just the entry ticket.
Three things I'd tell anyone in a similar position:
First, put calibration consumables on the same purchase order as the meter. Second, ask how support is delivered before you ask how much the product costs. Third, trust the tool that has proven itself, not the one that is simply cheap. I've added a budget line called 'things that make the equipment trustworthy.' It's not a SKU, but it's the cheapest insurance we buy.
