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 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!

Easy to use and seems to be very accurate.

This digital basal thermometer works excellently —it's accurate, reliable, and easy to use. However, there are two small drawbacks. First, the lack of a backlight makes it a bit tricky to read in the dark, especially first thing in the morning. I’d recommend the backlight version for easier use. Second, the power button is a bit hard to press, which can be inconvenient. Aside from these minor issues, it's a great thermometer!

It works just like a regular thermometer but instead of 3 digits it reads in 4 digits. It’s definitely easy to use, design is cute and small you can carry it anywhere, it’s got a a little case with it, easy to clean just a little wet wipe or sanitary wipe and it’s done. And it comes with a spare battery.

I loved that this thermometer was inexpensive for basal temp tracking. I thought it was great because I didn’t know if I’d even want to keep tracking, so I didn’t care much outside of the cost.That being said, the thermometer is great if you’re just looking for a quick temp to chart a pattern, not so great if you’re looking for accuracy. Since my original purchase, I’ve purchased other basal thermometers that will give close temps to each other but will give a whole degree difference to this one. If all of the others are .05 to each other and this one is going in the left field with a 1.00, I’m gonna have to call shenanigans on the “accuracy”.Overall, the temp comes up quick, the display is easy enough to read, and it was easy to clean. It was not physically comfortable to use, especially in my mouth. I wouldn’t buy it again, but if you’re looking to dabble there are worse options.EDIT: I changed my review to 5 stars. The company reached out to me and offered a refund, but they also offered me another thermometer. The new one is just as accurate as the most expensive basal thermometer I have while the original thermometer I had ordered is still inaccurate. There must have been something faulty with the first one I received.

I have been using this for about a year using FAMM. It was great for a few months but started to notice my temps were looking weird and spiked. I changed the battery and after a few weeks would return to not being reliable.The battery on the screen always looked low even after I changed the battery so it was hard to know if I was it needed a new one.I think this basal thermometer was a great first one but I recently upgraded to temp drop and it already has been way more clear!!It seems this product only lasts about 6 months before it doesn’t work anymore, so I guess you could just buy a new one when it stopped working but I wanted something more reliable especially since I’m avoiding pregnancy currently.I would recommend this product if your starting to track your cycle but would beware it may need to be replaced after a certain amount of months.

reference, ticket number is #1144312This product is amazing and guaranteed to workThey sent back a replacement after a few monthsNo problemsHighly recommend!

Great customer service! Product initially stopped working but was promptly replaced by manufacturer. For that reason, I would recommend this product and I would buy it again.