Smoke Detector Tester, 10 in. L x 9 in. W

works very well. Unlike burning matches and newspapers under a smoke detector is safe. A quarter of a second of pressure is more than necessary if you are using a paper or foam cup with the bottom cut off. the price is not cheap for such a small volume, but funerals cost much more. I am very pleased with the purchase and recommend it.

A small shot sets off smoke alarm almost immediately. Great for testing alarm systems. Takes a bit for alarm to clear and reset.

We purchased this smoke detector test spray for extra peace of mind after a close friend experienced a devastating house fire. Their smoke detectors had fresh batteries and passed the test button check, yet failed to alert them when smoke and fire started in their basement. Even after the fire, one of their bedroom detectors still tested “ok” with new batteries but did not respond to this spray—proving how important it is to properly test alarms beyond just pressing a button. The product worked as advertised, giving us confidence that our smoke detectors will respond in an actual emergency. I suppose the smoke from an extinguished candle could work for testing, but this spray is much more reliable. Plus, you don’t have to be inches away on a ladder with a smoking candle. I was able to use the spray from off to the side while standing on the floor, making it much safer and more convenient. It is a bit pricey for what it is, but considering the potential consequences of a malfunctioning smoke alarm, the cost is worth it for peace of mind. If it turns out my detectors work as the should during an actual fire I be sure to update this review from 4 to 5 stars!

Our local fire department recently upgraded its requirements for at-home testing of smoke detectors. Using the detector's "test" button is no longer seen as being sufficient for safety. So, rather than intentionally burning toast (over and over), I picked up a can of this spray. I don't know what's in it, but it reliably sets off our smoke detectors. One bit of warning -- ironically, the can's contents are flammable (according to its label). So take care in your testing to avoid ignition sources, unless you want your smoke detector(s) to have a real fire to make noise about.

Works Great. First Try. AFTER Reading the Directions on the Can.

Works well.Two for a good price

I got a 6 pack of smoke Alarms. They were interlinked. I wanted to be able to test . This worked Great! It will last a long time!

Works great

Great for testing smoke alarm.

perfect for semi annual inspections of rental units

Ordered thinking it was a good deal at three cans !! Got the smallest single can ever. !! Going to try and return