Who knows what these are, and what am I doing with them?

[Paul Sandhu]

First closest answer gets one of my 2020 bikini calendars.

[John Underwood]

Storage bin for dosimeters (measure radiation)

[Marcie Byrd]

I want to guess but the calendar scares me (no offense intended)....   I know you guys are pretty good natured

Truth, I have no idea what they are.

[Matthew Paul]

Tricorders , "Beam me up Scottie "

[Michael Baum]

I believe that @John Underwood is pretty close. The appear to be Radon detectors. Specifically Single Gas Detector. They can be used for various things like hydrogen sulfide.

They are in a basket which hold stuff, on a counter where you set stuff, just before using the hand sanitizer to clean your hands. :)

[Brendan Curley]

Multi gas meter for making sure an environment is safe while in a confined space. I think that hand sanitizer is what Paul uses after he looks at his calendars!!!

[Tim Johnson]

Drug test machines.  I'm only guessing because you talk about them often.  or ghost detectors 

[Paul Sandhu]

@Michael Baum @Brendan Curley are both correct.  They are called "sniffers".  They detect Hydrogen Sulfide gas.  The gas is a by product of petroleum refining.  One breath can kill a person.  Even in dilute quantities, one sniff will render a person unable to smell the gas and they can succumb in a minute or two.

All my tenants wear these, and some of them leave them behind in their STR.

So what is my purpose for keeping 3 of them in a basket?

[Ken Latchers]

You want to see if they have children

or it's a sniffer lost and found

[Reagen Natho]

@Paul Sandhu H2S monitor! I used to work in a oil & gas processing plant and had to wear one. I’m guessing you have them in case your tenants lose their’s. I used to always misplace mine and they are not cheap if you have to pay for them out of your pocket.

[Lauren Kormylo]

That’s your “welcome basket” for refinery workers. Plus a case of beer. 

[Paul Sandhu]

That basket is where contractors empty their pockets before taking a pre-access drug screen to get into the refinery.  A lot of contractors have never been in this town.  The H2S monitors are a conversation starter towards the STRs that I rent out.  They say "Did someone leave those behind?"  I say "They left them behind in one of my 23 houses.  I have 1500 regular people that stay in my houses when they come here to work.  It might be 4 weeks, 4 months or 4 years before they come back.  They get their monitor when they come back.  Why are you paying more money to stay in a dinky motel room when you can spend less to stay in a house where you can cook and do laundry?"  Then I give them a pen or calendar.  Tell them I have no vacancy right now but to call me the next time they come here to work.