Digital Basal Body Thermometer, 1/100th Degree High Precision, Quick 60-Sec Reading, Memory Recall, Accurate BBT Thermometer for Natural Ovulation Tracking by iProven

I have bought this 2 times. The first one lasted 3 years, and maybe it would have gone longer if I hadn't lost the replacement battery - but alas I bought a new one instead. The new one worked almost identically for just over 3 months, and then started acting up. Obviously amazon return was out, and the manufacturer says 100 days full refund, but I was about a week over that when it quit. Given it also has a 2 yr warranty and I had used the other one for 3 yrs, I emailed the manufacturer and they quickly got back to me. They suggested a trouble shoot and offered id it didnt work they'd mail me a new one. The troubleshoot didn't work. After letting them know they immediately sent me a replacement without any struggle. I am impressed. So while my 2nd one did have issues, I give this 5 stars for history and a company standing by their warranty. The thermometer measures fast and accurately. The Last feature is nice.

I was able to try both thermometers, so here's my feedback that will hopefully be useful for the next person. I originally ordered the thin thermometer but there was an issue so then I tried the one with the bigger screen. If I had to choose between the two, I would prefer the thin thermometer. The thin thermometer is your regular, basic bbt thermometer. To use, you turn it on, it beeps, then stick it under your tongue, all the way to the back (on either the right or left side), when you first wake up in the morning. It's best to have at least 4 hours of uninterrupted sleep for the best accuracy. Then it beeps twice, and then you can remove it from your mouth. You would then log your temp and the time on your bbt chart. If you wake up and it's still dark, you'll need to use a light source like the light from your phone screen to see the numbers. You can also just read your temp later on in the day when you're more awake because the thermometer remembers your last reading, but be sure to note the time that you took your temp. The bigger screen thermometer is more for someone who prefers to read bigger numbers with a backlight. You won't need a light source to see the numbers because it's already built in. The beeping sound is also louder. I wake up early when it's still dark so I did find the backlight blinding and the beep startling when I'm still groggy from waking up first thing in the morning. To resolve the light issue, I just flip the thermometer down. I haven't found a fix around the louder beep yet. Hope this helps!

Updated review: customer service for this product is top notch. They really wanted me to be satisfied with a thermometer and solved my issue. The second thermometer listed does have a light (with the larger screen). I got it 4 stars because of two reasons: the light stays on only briefly so you have to look kinda quickly, and this could be user error but there have been a few times (with each thermometer) that I thought it was ready my temperature but after over a minute I take it out and it’s just off. All in all, it’s precise to 2 digits and works for what I need! Oh, one more thing, the beep has woken my husband, so it’s not super quiet. Not a problem though since he’s usually awake before me anyways. And I like the case it comes in! Original review: I mean…I works…but heads up - there is no LED light. I know it’s supposed to be able to recall your last recording later but honestly it prefer one that has a light for easy reading without turning the room light on

For the price, this is a GREAT thermometer. Reads effectively, the beep is incredibly easy to know when it’s going. Takes one minute to read! Only thing it doesn’t have is a lit screen, so I usually have to shine a light on it.

Works great- has temperatures measured to two places past the decimal (like 96.68 degrees) And comes with an extra battery!!!

Maybe I have a faulty thermometer but it gives me a different reading each time, even when I do it back to back. Mine doesn't beep so I don't know when it's done (it says it is supposed to). It's important to know that this does not have a light on the screen so if you take your temperature each morning in bed before there is enough daylight in your room, you are going to have to fumble around to turn a light on or get the flashlight from your phone on to be able to read the screen. Any basal thermometer should have a built in light in the screen so you can read it in the dark because we are all obviously taking our temperatures in bed, in the early morning. And you're not supposed to move around a lot before taking your temperature. I'm super sad that I wasn't able to track this cycle because this thermometer let me down.

I ordered the smaller one a few weeks back. That was really not worth it. Very convenient to use. So I posted a review according to my experience and the team reached out to me promptly. They not only refunded the one I bought, but ordered the bigger one for me free of cost. And let me tell you, the new one is amazing! It is very accurate, very easy to use and looks sturdy. I cannot tell you enough about the product. The reading takes about a minute, but is stored for future. Decent size screen and backlighting make it very easy to read everything. It's worth every penny. A must try!

Worked great for two months. Til I dropped it once maybe 2 week from a nightstand and it wouldn’t make sound and the temperature went completely out of wack

Parfait pour prendre sa température tous les matins. Rapide. Précis. Je suis contente de mon achat.

Doing it's job so far. No complaints. Can't advise on accuracy as I have nothing to compare it to. Only used it 4 or 5 times so can't comment on battery life etc right now. Have purchased it as another way of tracking fertility as advised on a fertility app.

Using for Basel temperature. It does take up to 60 seconds to get a reading as it’s more precise, so bear with it. It was set to F first then was able to change to °C. Saw good and bad reviews and the overall great rating so gave it a try and happy with it.

Fijne thermometer om dagelijks je basale temperatuur bij te houden. Maakt wel een redelijk luide piep.

Very accurate!