Smoke tester I used back in 2005 I made as explained above

Still have and used it but now in 2022 Amazon asked if I would test and report my findings on this standalone smoke testing tool

This one is an Autool SPT 202, cost $180
It is fairly small as shown below
It has its own air compressor that will inject 10-15 PSI of generated smoke

It comes with hoses, nozzle and different size hose plugs
One useful adapter is an airbag which allows you to put in like a muffler tip or replace the MAF with this into the intake
Pump this up so that it makes an airtight path and in the center of this bag is a tube that carries the smoke through the airbag and directly
injecting smoke

Vendor states best to use baby oil, and only about 2 mL in smoker per use.
I suggest you use a mask or your mouth will smell of this oil

I tested this with a sealed bottle I made and made sure it had no leaks with smoker turned on for a good 15 minutes, and it has a pressure gauge
built in, and I found no leaks and pressure maintained at 13 PSI
I then added a small hole into the container and as shown below even in sunlight I could see and smell the smoke

Their user's manual is poorly written but being so easy to use you will get by doing proper smoke testing

This functions with a 12 D/C volts, most likely the vehicle's own battery or another voltage source

This can be used to locate leaks (even small ones) if used for vehicles like EVAP, intake, exhaust, A/C or hoses, etc
Also, could be used if looking for a leak like in plumbing pipes, etc.