Bolt Cutters & a Sledgehammer. Sometimes I have to take an abandoned lockbox off. 

A cooler for beverages, a box of goodies for buyer humans and a container of dog treats for the sellers' fur babies!

WD40 & Duct tape always comes in handy

I keep dog treats in the trunk of my car ... not sure it relates necessarily to real estate ... but we just never know. 

Water key! That's a good thing to have, and I should get one instead of terrorizing the handydandy dude!
I have so much stuff in my toolbox - compass, 100 foot tape, laser room measurer, 5 lb sledgehammer, outlet tester, duct tape, metal tape, gloves I never wear . . . probably the most unusual is bailing wire - need it often to keep signs anchored to fences or wherever when it's super windy.
And bungee cords. Because . . . ya never know when you'll need to restrain someone . . . er, uh, something.

Since the snow flies up north, I keep the following in my car November-April:

Shovel, snow brush, ice scraper, sand, boots, hat, gloves, extra jacket with hood and wool blanket, just in case.

I carry a fly swatter in the shape of a house ... in my purse and in my car to give to clients in the Spring, Summer and Fall months -- always a big hit with the clients!

Wow, wish I had one of those. Around here we need them on a 6 ft pole or so to go into the sidewalk 'cirle' thing.

All I got is a tennis racket for hitting my dogs balls in the park.

I use Hiya which is a free phone app that shows me spam calls. Saves a lot of anger management time.

I always had a shovel in my jeep.... and a container of sand.....

Professional quality handheld gps

Mine is not unusual. It's Listing & Sales Agreements!

Toilet paper, because you just never know.  I like the water key idea, I have a few of those combo ones at home, I should add that to my tool bag.  I do carry smoke detectors and CO detectors when I go to an appraisal.

Never heard of a water key. I actually carry very little in the trunk of my car, but do have (1) a 100 foot measuring tape and (2) a large rubberized mallet with which to pound my signs into the ground and (3) WD-40 to loosen up pesky key locks.

WD40!

I still carry a Yellow Pages. Even though you can find almost everything via the internet, sometimes you just do not have good internet access or you can't find what you are looking for.

My toolbox is pretty light - a laser for room measuring and a flashlight.  I'll read through and see what might be a nice add...

Stuffed animals for the kids.

      24 inch metal spike and a hammer, to prepare holes for the sign frames when the ground is really hard.

Take a Look

Yoga mats   A

Winter-gal bottle of water to loosen up signs in frozen ground

I never had to turn the water back:) As for unique thing.....I'm usually the one who bring and attaches CMDs before inspections. 

I don't have any tools in my car for RE. 

My digital measuring tool - I love it

Water key, WD-40, zip ties, electrical tape, plumber's tape, duct tape, scotch tape, sink snake, rubber mallet, lock-pick set...where do I stop?!?

Parked and reading...

Those all in one pocket knives covers it all for me

My Spider stick, I wrote about it earlier in the year, maybe time for an updated blog

Knock down wasp spray.

Slydial.

SugarCRM.

None. 

Oh my smartphone, Tammy.

wow, that is a good one,  good for you!

I don't know about unique, but always a roll of toilet paper.

My golf clubs. You never know when the urge will strike me to beat a client over the head!

I guess it's my Tesla.

Nothing unique.

Tape measure, cooler for drinks, disposal alan wrench for jammed disposals, chart with the standard sizes for beds and yes an actual tool box with  duct tape, WD40 and zip ties.

I have lots of baby wipes for cleaning my shoes, hands and also treating spots on clothes.

I have an entire tool box in my trunk

I would have to say my ability and intuitiveness to know and understand keywords and SEO. 

The more tangible thing will have to be my iPhone 7 plus for taking photos.