





Price: $14.97
(as of Nov 27, 2025 22:00:05 UTC – Details)
From the brand

Thermometers
Pulse Oximeters
Product Dimensions : 6 x 0.01 x 0.01 inches; 2.4 ounces
Item model number : BBT-127
Batteries : 1 Nonstandard Battery batteries required. (included)
Date First Available : November 29, 2022
Manufacturer : iProvèn
ASIN : B0BNL95N2V
Best Sellers Rank: #14,731 in Health & Household (See Top 100 in Health & Household) #3 in Basal Thermometers
Customer Reviews: 4.2 4.2 out of 5 stars 6,898 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Accurate Ovulation Cycle Monitoring – Track your cycle with iProven’s BBT thermometer each morning for reliable, 2-decimal readings needed for natural fertility planning. Track your cycle and figure out which days of the month are the most fertile.
Upgraded Design with Jumbo LCD Screen – With a basal thermometer for ovulation, the reading will take slightly longer than a regular oral thermometer due to the high degree of precision and accuracy. Our new & improved jumbo sized backlit screen is easy to read in the dark, so you won’t need to squint or strain your eyes in the morning.
60 Second Fast BBT Reading – The upgraded iProven algorithm delivers the fast and accurate readings in only 60 seconds. You can enter measurements manually into a paper fertility tracker chart, or download any ovulation tracker app and input the data yourself (independently, does not have Bluetooth app syncing)
30 Memory Recalls & Improved Features – Built-in memory recall of the last 30 readings is perfect for when you fall back asleep or forget to write the temperature down. Small waterproof tip is rigid for enhanced precision with less chance of deviation. The gentle confirmation sound beeps clearly. Hold the button to easily switch between °F/°C
100 Day / 100% Replacement Guarantee – Every order is backed by our confidence guarantee and 100% replacement policy during the first 100 days. Our dedicated Customer Care team is ready to serve and resolve any question or issue you may have. Discover why so many new moms and moms-to-be are so glad they chose iProven!
13 reviews for iProven Basal Body Thermometer with Backlight & Big Digits, 1/100 Degree High Precision, BBT for Ovulation Tracking, 30 Memory Recall, Accurate Fertility Temperature Tracker
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$14.97

Anna –
Long lasting
I bought this like 6 years ago and the screen finally gave out on me. It’s worked amazing, and lasted WAY longer than my other ones (they lasted not even a year – but that was technically my fault cause they were the kind you have to shake back down afterwards, and I would accidentally hit them on something while trying to shake it down & I have a big mess to clean up. Lol)It doesn’t have a backlight, but it saves the temp, so if you fall asleep you can see what it was when you get up, so I always did that. Who wants to try to record their temp when they’re super sleepy anyways? LolIt seemed very accurate and I liked it so much I bought one for my sis-in-law. I will be buying another one soon to replace the one that the screen messed up on.
mom5kids –
Works great and if not warranty/service is great
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.
Natalie –
I like it
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
Jessica –
BEST BASAL BODY THERMOMETER EVEEERRR!
I can’t say enough about this thermometer. It’s one of the best, actually it is THE best out there! I wouldn’t change thermometers, even if they paid me. iProven thermometer customer service is TOP TIER they always to response to any questions within a few hours! The ONLY BBT that’s clinical proven – which is really important to me. PLEASE iProven don’t ever change your thermometers I wouldn’t know what I’ll do. I’ll probably cry my eyes out and have no tears left. So please, never change your product on us.
Vanessa molina –
Awesome thermometer
I ordered this thermometer and it works great! Something did happen to it not sure what, but I had reached out to customer service and they took care of me right away and sent me another one. You are in good hands with them.
Zac W. –
Didn’t work. Make sure to get a thermometer with a screen that lights up
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.
Danella –
Fácil de usar
Fácil de usar, de almacenar. Cumple su función, lo único es que no tiene luz para ver los números.
Kjrg19 –
Security seal broken and retaped
Security seal was cut and a new sticker applied. I thought I was buying this item new but it’s not. Just be aware when buying this product. The display is easy to read and thankfully it was easy to clean (just be sure to clean before use in case it’s a returned product like mine). It has one button and is easy to use but takes awhile to get a reading.
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B –
Great product. Fast delivery. Packaged well. Spare battery. Ability to save and read measurement later. F and C temp readings. .2 decimal places too.
Anuoluwapo David –
I love, love this product. Comes with its own batteries and extra. Its instructions are very clear and detailed. Definitely worth the purchase
Mada –
Really good product.Very accurate I recommend.
Natalie –
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.