What boiler service tools do you carry with you?

I'll add:

Personal CO detector.

Headband flash light.

Alligator clip jumper wire with 24 volt reset breaker.

Transfer pump & double end hoses.

N95 masks.

Assorted pails.

Coverall jump suit.

Allen keys, standard and metric

Nutdriver, must include 1/4" and 5/16" larger can be helpful too.

Pocket screwdriver.

Small and medium adjustable wrenches.

I could go on, but I think you may be focused on diagnostic tools and not really hand tools.

I do av but i really like the klein 11 in one screwdriver.
it has #1 and #2 phillips, 2 sizes straight blade, 2 torx sizes, 2 robertson sizes, and the barrel and adapters are a number of sizes of nutdriver.
you can take the barrel out and spin it between your fingers for long fasteners that tun relatively freely
you can use an adjustable wrench and the inserts with the bit in them to use it like a right angle screwdriver

obviously you will still need a long #2 phillips and a long straight blade to reach especially some fasteners in recesses.

i think after decades of working on cars i've learned a lot of creative ways to reach fasteners in weird places

trouble light type light that takes the same batteries as my codless tools.

I also have reached an age where i need a milk crate or bucket to sit on down low.

Don't forget the BOOTIES!

open eyes and a open mind for starters

6 n 1 screw drive

1/4 deep socket set

fluke multi meter

assorted hand tools

Flash light

finally a pair of eye glasses

a working knowledge of the sequence of operations for the equipment you are servicing and knowing the safety devices which may be at fault

A good grip on the workings of controls ,opposite potentials,time delays ,flow switches ,magnetic starters voltage and over current, phase monitoring controls and how not to let the smoke out of a new control .

Being truthful and not broad brushing existing issues which may not be ideal but are not the root cause of the existing issue .

Only work on equipment which you are qualified and comfortable working on and being smart enough to known when your in over your head.

Knowing how a system should properly operate and when it is time for regular maintenance or that said maintenance has been deferred which is the underlying issue

And also have a possibly older smarter tech which when having a rough time you can call on for some intelligence discussion with about your issue .

Never be afraid to admit that your at a lose .

Honestest is always the best policy

peace and good luck clammy

Yours looks like mine. It's getting heavy. I need to find another way.

what is "opposite potentials"?

i like the one i posted because the shaft pulls out and i can use it like the second one you posted for a lot of things.

i haven't found a version of a precision screwdriver i like better than the one i got free at a trade show about a decade ago. the barrel is a single aluminum piece so it is thick enough it won't stab through your pocket and the barrel has a cap on the end that stores the bits. i bought an assortment of whia bits for it.

something like this. i don't know if there is a brand name version:

@clammy has an interesting tool proposal. "Opposite Potential", which is to say that "similar potential" or "opposite impossibility" might be tools that his counterpart might bring to the table. That is not to say that "Similar Impossibility" might not also be considered another tool. This is all based on the theory that "opposites attract", which in turn causes "similars to repel". Although since I have been stuck in this wheelchair, I have not had the opportunity to Repel down the side of a mountain, or climb a mountain for that matter,   ...but that is a story for another day, today we need to purchase a steamer trunk to use as a tool pouch in order to carry all these new tools to @RayWohlfarth’s next boiler service call. along with @ethicalpaul 's video equipment in order to document how each and every tool was used in order to figure out that someone just left the switch turned off.