A Receiving Checklist for Pressure Gauges, Multimeters, Thermal Cameras, and Insulation Testers

What This Checklist Is For

I'm the office administrator for a 150-person industrial services company. I manage MRO purchasing—pressure gauges, test equipment, small instruments, sealing supplies—roughly 60 to 80 orders per year across seven or eight vendors. I report to both operations and finance, so I see when an expensive order sits in receiving for a week, or when a technician complains that the wrong range was ordered.

I am not an electrician. I never claimed to be one. But I am the person who usually reads the manual first because I need to know whether the equipment was ordered correctly and whether it is ready to hand over. This is the checklist I have developed since I took over purchasing in 2020. It has cut a lot of noise out of my workday. Plus, it turned out that some of the most useful technical checks are pretty easy to do before calling in the maintenance team.

This is for anyone whose job is not exactly "instrument technician," but who still has to buy, receive, and confirm a tool before it disappears into the field.

The 8-Step Receiving and Verification Checklist

Step 1: Check the box and the tag before accepting

The first step sounds obvious, but it is usually skipped. When a package arrives, I inspect the outer box for dents, cuts, or signs of oil stains before the driver leaves. Then I open it and compare the label on the instrument against the purchase order. Do not just compare the product family. Compare the exact range, unit of measure, and optional features.

I learned this the hard way. I ordered what I thought was a 0–30 psi digital gauge. The model number matched the catalog page, but the configuration line was stamped 0–100 psi. The technicians caught it during installation, and we lost about twelve days waiting for a replacement. That one cost me a restocking fee and a few uncomfortable finance conversations.

Also, take a photo of the outer box and the tag before moving the instrument anywhere. It does not cost anything, and it gives you evidence if a damage claim is needed.

Step 2: Write down the model number and serial number from the back of the unit

This is the part I used to avoid because it felt like overkill. The invoice has a part number, so why do I need the serial number? The answer is calibration. Many instruments like Ashcroft digital pressure gauges come with a calibration certificate, and the certificate is tied to a serial number, not the model number.

When I receive any instrument, I immediately record the serial number in a log. I also keep a copy of the calibration certificate. If the vendor later asks for the serial number to check firmware or warranty coverage, I do not need to chase the technician around the shop.

Most of these tools are not one-shop items. They will go through recalibration, repair, or battery replacement one day. That paper trail makes it easier.

Step 3: Find the Ashcroft digital pressure gauge manual before you need it

If you are dealing with an Ashcroft digital pressure gauge, do not wait until it is connected to a live line to search for the manual. I keep a folder on a shared drive called "Manuals" and every new instrument gets its manual placed there on the same day it arrives.

I usually search "Ashcroft digital pressure gauge manual" along with the model number, then download the PDF from Ashcroft's site. The manual covers button sequences, zero function, unit selection, and communication setup. Even if the tech knows the gauge by memory, the new intern may not.

A quick tip: if the gauge has been sitting in storage for months, the battery might be low. The digital pressure gauge manual usually lists a low-battery symptom, but I have seen units appear "dead" when they were just in a battery-saving mode. That is not a manufacturing defect. That is a small thing that a manual check can solve before you schedule labor.

One surprising step I now do is zero the gauge while it is vented to atmosphere before I hand it to the crew. Digital gauges can have a small offset after shipping. The manual explains how to zero the unit safely with the pressure port open. This is not the same as calibrating it. It just makes sure the display does not show 0.2 psi when no pressure is applied.

Step 4: Label the Ashcroft differential pressure high and low side

Ashcroft differential pressure instruments are not the same as regular pressure gauges. They have a high port and a low port. Mixing them up will produce a negative reading or a confusing one. I do not rely on field workers to guess which side is which after I receive the unit. I check the diagram in the manual and add a small label to the housing if the port labels are faint.

This came up during a vendor consolidation project in 2024. We ordered several differential pressure transmitters for a filtration pilot setup. The high side was supposed to go to the upstream side. When the unit was installed backward, the system did not alarm the way the controls engineer expected. Troubleshooting took most of a morning. It was not a product quality issue. It was a labeling issue.

Also, when buying, watch out for the static pressure rating and the maximum differential rating. The range on a differential pressure instrument is not the system pressure rating. Make sure the process pressure does not exceed the housing rating.

Step 5: How to use a multimeter without making smoke

I am not going to tell you to diagnose a motor drive with a multimeter. But I do use one for the same basic 10-minute check before placing a tool in the maintenance cart.

The handiest trick is simple: black lead goes into the COM jack, red lead goes into the V omega ma jack. To check a battery, set the dial to DC voltage, which is usually marked with a straight line or V with a small straight top. To check an outlet, set it to AC voltage, often marked V with a wavy line. Start on the highest range if there is no auto-range, then move down until you see a stable number.

If you want to check continuity—which is what tells you a fuse is blown or a wire is broken—move the dial to the speaker symbol or the "continuity" position and touch the two probes together. You should hear a beep. That beep means the meter is working before you start testing.

If I am buying a new meter, I check the safety rating on the side. According to IEC 61010-1, a meter with a CAT III rating is intended for distribution-level circuits, while a CAT II rating is generally for outlet-level measurements. A meter with no rating at all is not something I am allowed to put on a purchase order anymore. I know it is tempting to think a multimeter is just a multimeter, but the safety rating is not a marketing feature.

Per FTC advertising guidance, claims like "CAT III certified" should be substantiated. If a listing does not say which standard or rating it meets, request a datasheet or an actual manual page before buying.

Step 6: How to use thermal cameras without chasing reflections

Thermal cameras are one of those tools that look easy until you point them at a shiny pipe and get a useless orange blob. A thermal imager detects surface temperature patterns, but reflective metal will reflect the heat of whatever is behind the person holding the camera.

For basic building checks, I set the emissivity to about 0.95 when scanning painted surfaces. For bare metal or shiny surfaces, emissivity is lower, and the camera will need a different setting or a piece of low-emissivity tape. I keep a small roll of black PVC electrical tape handy for those checks. It gives the camera a known reference surface.

I also make sure to take a normal photo at the same time as the thermal image. That sounds simple, but when you look back at the files later, you will not remember which panel was which. Thermal cameras that have a built-in digital camera make this easy. If yours does not, take a phone photo immediately after.

Before using any thermal camera on electrical gear, follow your facility's arc flash policy. If the panel must stay closed, use the viewing window or call the electrician. The thermal camera is not a magic safety pass.

Step 7: How to use a Megger insulation tester safely

The name Megger is a brand, but in the field everyone says "Megger" when they mean an insulation tester. This is the piece of equipment I treat with the most respect because it intentionally generates a high DC test voltage.

Here is the basic idea: the insulation tester applies a voltage—often 500 V, 1000 V, or 2500 V depending on the model—and measures how much leakage current flows through the insulation. That reading is shown in megohms. Good insulation shows a high resistance. Weak, wet, or damaged insulation shows a low one.

Steps I follow when using a Megger insulation tester, or supervising someone who is about to use one:

• Lock out and tag out the equipment first. The insulation tester is only used on de-energized equipment.
• Confirm de-energized with a known good multimeter before connecting the Megger.
• Use the correct test voltage for the equipment. When in doubt, read the manufacturer's instruction or ask an engineer.
• Connect the tester leads securely. On most low-voltage motor checks, one lead goes to the winding and the other goes to ground or the motor frame.
• Hold the button or press test for about 60 seconds and record the reading. A low reading does not always mean failure, but it is a red flag.
• Never use an insulation tester on electronic control boards, sensors, or any device that is not designed for high-voltage testing.

I once watched a technician quickly test a motor, and we almost tested the wrong phase because someone had left the isolation switch labels swapped. So I say it again: verify you are on the right circuit before you press test.

Step 8: Log every reading, manual, certificate, and location

Here is where the efficiency part kicks in. A pressure gauge is useful only if someone can find it, prove it is calibrated, and know where it was installed. A digital gauge sitting in a drawer with no manual, no certificate, and no serial number is just an expensive paperweight.

I set up a shared spreadsheet with these columns: asset type, manufacturer, model, serial range, calibration due date, manual link, certification link, assigned location. It took me one afternoon to build, and it saved our accounting team about six hours a month because we stopped digging through email receipts by hand.

This is not about replacing a technician's experience with a spreadsheet. It is about making sure the technician does not waste time looking for the basics. Plus, when I bought the wrong range back in 2020, a simple log would have caught it earlier.

Common Buying and Handling Mistakes

I have made a fair number of mistakes so you do not have to. The biggest ones are pretty consistent.

The first mistake is trusting a generic description instead of a datasheet. If a product page says "digital pressure gauge" without naming the maximum overpressure and burst pressure, I do not buy it until the manufacturer datasheet is reviewed.

The second mistake is ignoring the zero function on a digital gauge. It is tempting to think that a digital pressure gauge is always zero because there is a number display. Most digital gauges have a zero or tare function that should be used at atmospheric pressure. It is not a magic auto-zero process.

The third mistake is treating an insulation tester like an ordinary multimeter. The Megger is a high-voltage test instrument. That is not the same as measuring resistance on a wiring loop.

The fourth mistake is letting instruments sit in receiving for weeks. If a unit is DOA, the return window may close before anyone opens the box. I now put "receive and inspect within 5 business days" directly on the purchase order.

Bottom Line

Efficiency is not just about automation. It is about not having the same problem twice. If you buy high-quality instruments like Ashcroft pressure devices but then skip the manual, skip the serial log, or skip the safety rating check, you are creating the next emergency for yourself.

This checklist works because it is boring. Check the box. Read the tag. Download the manual. Label the ports. Verify the meter rating. Log the certificate. Store the file. That is the whole game.

One last thing: this was accurate as of Q1 2025. Products, manuals, and model designations change, so do not treat any of the specifics here as permanent. Verify the current Ashcroft documentation and any applicable IEC or facility safety requirements before you finalize your own receiving process.