TN311 Heavy-Duty 24-Hour Indoor Mechanical Plug-in Timer - Efficient Control for 2 Devices, Customizable Scheduling - Timer for Lighting, Fans & Small Appliances

These are, as far as I know, the only timers that have designated "on" trippers and designated "off" trippers. I plug my crock pot or other device into this when I want it to turn itself off if I forget to do so. So, I just install only one of the "off" trippers. I place no other tripper on the wheel. I use the manual switch on the timer to power up the crock pot and set the "off" tripper at some time when I want it to turn off. Then, if I am going to be really late coming home, I know it will shut off before a dry crock pot starts blazing. And, because I only installed an "off" tripper, it will never start up the crock pot again on its own.Other timers that have trippers have trippers that are all the same. If I used one of those, then the timer would turn off but it would also start up the crock pot the next day when that tripper was encountered in the next 24 hour cycle.I like to slow cook meats over 12 or more hours and I put it out in the garage so it doesn't stink up the house. (Lots of spices, chilis, and onions slow cooking over many hours can impregnate your drapes, carpets, and woodwork with aromas that won't go away for days and days...so I put it in the garage.)I could certainly envision a day when I set the food to cook, but I would get called away on a late night job, It would be just like me to come home tired, go to bed, and forget entirely about the food cooking in the garage. In good weather, I'll park my car outside. It could be days and days before I remember the food in the crock pot out in the garage.With this Intermatic timer, no problem. Fire department didn't have to come. It shut off the crock pot and won't start it up again, and again, and again like other timers would do.These timers will work with inductive, resistive, magnetic fluorescent, and electronic fluorescent, including twistie bulbs. It's got a 15 amp 3 prong outlet. Motor turns the wheel. Simple. Reliable. I like it. The operative logic of such a simple device is bullet proof.What if the power goes out? It starts up again when power is restored. But, oh, you say, your food will be rotten if it's off more than a half hour? No problem, Just look at the wheel when you retrieve your food. You set the wheel for the correct time when you started cooking. If the time is off more than whatever period you think is unsafe to eat? You will know.

A reliable and accurate timer for your home needs.

I got this because I have a wall mounted swamp cooler that cannot be programmed to turn on or off. (I first heard about this device from reviewers that owned food dehydrating machines that did not come with an automatic off option, and they would remedy it by plugging in dehydrator into a timer and set it to turn off after set hours). This is simple, yet useful. The timer on the dial is not accurate to the "T" but it's close enough and good enough. I got tired of coming out to the living room in the middle of the night, shivering, because the swamp cooler would get our house too cold by 2am, but it's just too hot here in the evening (bedtime) to shut it off, and this was the solution for me. I only need one set of red and green for now; have it go off at 1am-ish and come back on at 9:30-ish in the morning.. (Not to mention there's the on and off switch on top in case I just want to shut it down) but during the winter when I am not using the swamp cooler I may use this for some other appliance.. not sure what yet. As of writing this review I had this unit for 3 months and it's been working without failure.Also, I like that it directs the plug to the side to the right (as you can see in the pic) so that it would make whatever plug fit behind furniture or tight spaces.If there's only thing that makes me question it, is when it goes from off to on, I see a contained, but visible static spark sort of inside the dial up on top. I'm not sure if that's just normal or a hazard since I'm not an electrician. I will post that question on the review page and see what others say.

Works well, lasts for a satisfactory amout of time.

These replaced two lamp timers that I had used for maybe three decades or more. So, the old, identical, ones lasted well.I like that you can set the timers to turn the lights on and off multiple times a day, so if I have to get up when it's still dark in the morning, and I also want the lights on in the evening, I can set one light for both times of day, and not think about it again until we change the clocks.The timers can be used for things other than lamps---anything that you want to go on/off automatically. They are easy to set up, and also come with instructions. Glad they are still available!

Needed a timer with a ground plug and this does the job. Looked in a few places but could not find locally. Amazon to the rescue

I've been using these timers for about 10 years now and have never replaced them. I am looking to purchase additional timers for more holiday lighting, however, I was disappointed to learn both Home Depots in my town had discontinued these and replaced them with a not-so-user-friendly brand. I was so pleased to see Amazon selling them. The other brand works, but they cannot compare to Intermatic. The Intermatic are easy to use, precise and reliable. I have never had a problem with them, in fact, I have been using them to turn on and off a variety of July 4th, Halloween and Christmas decorations throughout the year inside and outside my home including multiple light strands wrapped inside and outside my barn, around trees, around lamp posts, wreaths, garland, reindeer and other ornamental lighting. They're so easy to set. You can set up to three occurences by just moving around the little clips at the appropriate start and stop times. The little notch on the wheel grabs the clip and turns it on, then spins around and turns it off at the next clip. If you want to bypass the timer settings, there is a little knob to turn it on manually. I've always used the timers with name brand heavy duty extension cords from the home improvement stores. Never a blown circuit or plug or timer! And these timers are turning on and off a good amount of electricity. I can't say enough good things about this timer. Thanks for offering these Amazon.