Choosing a Thermometer

Glow

To measure your bbt, you’re going to need a bbt thermometer.  This is simply a very sensitive thermometer that is able to identify even the tiniest of temperature changes, usually to the one-hundredth (0.01) of a degree Fahrenheit.

A woman’s basal body temperature, which is the temperature when her body is completely at rest, rises ever so slightly just after ovulation. Three days of a continued rise in basal body temperatures will confirm that ovulation did indeed take place.

A quick online search will let you know that you can purchase a bbt thermometer anywhere from $10 to $200. That’s a pretty wide range and can leave anyone feeling unsure of their product choice.

We’re here to help though.

Here are the 2 things you absolutely need when purchasing a bbt thermometer:

  • It should be accurate to one-hundredth (0.01) of a degree

  • The screen should light up for easy reading in the dark

Everything else is just gravy.

Other features that may make your life easier are:

  • The screen displays the time and date, which may help you in recording the info

  • The ability to recall previous temperature readings

  • The ability to take the measurement quickly

  • Buzzing, instead of beeping, in order to measure without waking up your sleeping companion

  • Auto shut-off so you don’t waste battery life

We recommend purchasing one of the more inexpensive brands available in your drug store or online before making the commitment to a $60+ thermometer that you may end up deciding not to use.

Reference Source

73.1k views • 352 upvotes • 236 comments

COMMENT (236)

Na

Posted at
I was involved in a survey recently looking at a possible band style thermometer, almost like a fitbit, that you'd wear overnight and it'd record your temp without ever waking you up. Now I'm disappointed it's not already on the market! Hell, why isn't there a Glowbit, which could measure my temp and sleep pattern and exercise level and sync with the app? Come on developers, let's get a lady band on the market!

Ma

Mariana • Feb 10, 2023
Glow has a coupon for AVA? How do I find this?

Mo

Mona • Jun 1, 2022
Also some health insurance plans may have something similar. I'm disabled and my Medicare advantage plan has a flex account I can use to buy certain medical related items each quarter.

Mo

Mona • Jun 1, 2022
Same!!!

El

Posted at
BBT is probably the most useless for achieving pregnancy so idk why they're promoting this. BBT only tells you AFTER you ovulated, and you definitely don't ovulate the same day every month....thus with taking BBT you're basically looking for patterns of last month's cycle which may or may not apply to this month's cycle. This really is a waste of time compared to more accurate and applicable ovulation techniques. (I have a very regular cycle and i still don't ovulate or start my period the same days each cycle). Checking ur cervix and cervical mucous daily and/or ovulation tests are better options if having difficulty TTC.

Am

Amber • Mar 29, 2021
And if you have given birth or even miscarried, your cervix can stay high and slightly open all the time (like me).

Li

Lindsey • Mar 4, 2021
Also - cervical position is the next useless testing! Unless you’re perfect and your body is amazing, everyone’s position is different and it’s the most hardest test to achieve accuracy on! A lot of women’s cervix doesn’t change drastically and a lot of women can’t decipher the heights properly

Li

Lindsey • Mar 4, 2021
But it tells you IF you’re ovulating! And will stay high if you’re pregnant! A lot more useless things out there! It’s an amazing tool into anyone’s fertility journey - just because you don’t “like” it, it is proven to be useful!

Iv

Posted at
For anyone who may be interested in trying the Ava, a fitbit-like bracelet that measures your fertility, here's a $40 off discount link! http://avawomen.ref-r.com/c/i/10619/6053722

bi

bianca • Sep 19, 2021
I’ll try it send me link

As

Ashley • Feb 9, 2021
Try Mira! It’s working wonders with me.

As

Ashley • Feb 9, 2021
I’m using Mira abs I have pcos...tracking hormone correctly.

li

Posted at
I don't get it. So do you the thermometer to check if you have already ovulated? Or do you use it so you can know ahead of time when to dtd? I'm so confuseddddd

Sh

Sh • Jan 24, 2020
Checking BBT can also help you predict pregnancy as another sign before you can even test. A pregnant woman’s temperature stays elevated.

Ka

Katie • Mar 15, 2019
It tells you when you already ovulated

An

Posted at
I was interested in the AVA braclet until the price horrified me. Its so expensive.

So

Posted at
Do you know any brands with the buzz instead of the beep?

Ka

Kameisha • Sep 9, 2020
Do you have a link for it? I can’t find it?

Ma

Makayla • Apr 8, 2020
Kindara

👧

👧🏼 • Feb 18, 2020
Nope, Ovy (Bluetooth)!

💎

Posted at
Why would I need something to tell me I already ovulated? I want something to tell me when I'm about to ovulate.. I was thinking about getting a bbt thermometer but after reading this I'm glad I didn't and I won't now. 👏

no

no • Dec 18, 2021
No

Ka

Kameisha • Sep 9, 2020
Yess. My doctor wants me to do it just to see if I’m ovulating. 🙏🏻🤞🏻

Ja

Jay • Jun 26, 2020
I was doing a little reading and charting these temperatures seem to tell you a lot...even give early insight on a pregnancy. I just ordered a device to wear nightly, it sticks to you. I hope it works out for me.

De

Posted at

Sa

Sarah • Dec 3, 2018
I ordered one off amazon and can’t wait to try it.

Da

Danielle • Jul 20, 2017
I just ordered one on amazon!

Ch

Charlotte • Jul 19, 2017
They are sold out everywhere, where did you purchase yours?

Em

Posted at
Get Ava! BBT is not a good way to track ovulation! Premium Glow members: check Glow exclusives for a coupon! It monitors your temp, hormones, sleep,...etc etc etc...ALL NIGHT!

Ge

Geraldine • Oct 21, 2018
Where do you purchase them from

L

L • Oct 3, 2018
$250 ....if it worked like a fitbit or even just showed the time and could be worn more than just while sleeping then I'd be more inclined

Ma

Marie-Claire • Jun 21, 2018
I don't think PCOS sufferers can use it!

Ha

Posted at
I've bought a OMRON MC652 which can read temperature within 10 seconds. I think its clear usuful.

Ka

Katie • Nov 18, 2017
Very nice. Mine takes so long I fall asleep. Today my reading was super low but I think it's cause I fell asleep and my mouth opened lol