Femometer Thermometer Review: Is It Good for BBT & Family Use?

Quick Verdict

The Femometer thermometer is a no-frills digital thermometer that does exactly what it says on the box. It reads accurately, switches between °F and °C, stores the last result in memory, and comes with a storage case that actually survives being tossed in a bag. After two weeks of testing it on three different people at three different times of day, I'm comfortable saying it's a solid choice for general family use. If you're buying it specifically for basal body temperature tracking, it will do the job — just know that a dedicated BBT thermometer with app sync exists if you want tighter precision. Rating: 4.2 out of 5.

What Is the Femometer Thermometer?

The Femometer is a digital clinical thermometer designed for oral, rectal and underarm use across all ages — from newborns to adults, and pets too if you ever need it. It uses an advanced sensor probe to detect fever accurately and displays readings on a clear LCD screen. One feature I kept coming back to: it stores your last reading in memory. That sounds trivial, but when you're logging your temperature first thing in the morning before your brain is fully online, not having to squint at a fading number is genuinely useful.

The thermometer ships with a hard plastic storage case, a CR1220 coin battery already installed, and a quick-start guide. It comes in Klein Blue, which is a nice nod to the brand's blue-and-white aesthetic — it looks clean on a shelf and doesn't look out of place next to other health items in a bathroom cabinet.

Key Features

• High-precision sensor probe for accurate temperature detection within ±0.1°F
• Works orally, rectally and underarm — suitable for all ages and pets
• Memory recall stores the last measured temperature automatically
• Clear LCD display with fever alert beep, low battery warning and auto power-off
• Waterproof tip for easy hygienic cleaning under running water
• Hard plastic travel case included in the box
• Switchable between Fahrenheit and Celsius with a single button
• Flexible, tapered tip designed for comfort during readings

Hands-On Review

My testing protocol was straightforward: use this thermometer alongside my existing clinical thermometer for a week, then use it exclusively for another week. I tested it on myself in the morning (oral), on my partner (underarm), and on my seven-year-old, who is currently a walking petri dish after starting Reception class.

The first thing I noticed was the flex tip. It genuinely feels less intrusive than the rigid probe on my old thermometer — a small thing, but it made a difference when checking my daughter's temperature at midnight. She barely stirred.

Accuracy-wise, I compared readings with my existing thermometer over several mornings. The Femometer consistently matched within 0.1°F, which is what I'd expect from two clinical-grade devices. For fertility tracking, where you're watching for tiny shifts in baseline temperature, that consistency matters more than absolute precision. I should note: some cycle-tracking protocols call for 0.01°F accuracy, and this thermometer only reads to one decimal place. For casual BBT monitoring, that's fine. For protocols where every hundredth of a degree counts, you'd want a dedicated basal body thermometer.

By day four, I was already reaching for the Femometer instead of my older model. The waterproof tip is genuinely practical — I rinse it under the tap, dry it with a tissue, and pop it back in the case. No disposable probe covers needed, which saves money and produces less waste. The storage case is solid enough to protect it in a bag, which matters when you're grabbing a thermometer on the way out the door.

What surprised me was the beep. It's not loud, but it's distinct enough that you wouldn't want to use silent mode in a sleeping child's room. I found myself cupping my hand over it to muffle the sound on the third night — a minor gripe, but worth mentioning.

Battery life seems reasonable. After two weeks of heavy testing (probably 40+ readings), the low-battery icon hasn't appeared yet. The CR1220 is a coin battery, which you can find in most pharmacies and supermarkets, though it's less common than AAAs.

Who Should Buy It?

• Families with young children who want one reliable thermometer that everyone can use — the flex tip is genuinely more comfortable for restless toddlers.
• Women beginning temperature-based fertility tracking who want an affordable entry point before committing to a dedicated BBT thermometer with app sync.
• Anyone who travels and wants a compact, durable thermometer that won't get damaged in a suitcase or nappy bag.
• People who hate buying probe covers — the waterproof tip means you can clean and reuse without consumables.

Skip this thermometer if you're following strict fertility protocols that require 0.01°F precision and automatic data logging to an app. You'll outgrow it quickly and end up buying a dedicated BBT thermometer anyway.

Alternatives Worth Considering

• Femometer Violet BBT Thermometer — the same brand's dedicated basal body thermometer with Bluetooth sync and a companion app for automatic cycle logging. Worth the upgrade if BBT tracking is your primary use.
• iProven BBT Thermometer — reads to 0.01°F precision and has a memory function optimised for fertility charting. A popular choice in the TTC community.
• Withings Thermo — a no-contact thermometer that gives readings in two seconds. More expensive, but if you have wiggly kids or multiple family members to check on quickly, the speed pays off.

FAQ

Final Verdict

After two weeks with the Femometer thermometer, I'm comfortable recommending it as a dependable, well-priced option for most households. The flex tip, waterproof design and memory recall make it genuinely practical for everyday use — and the price puts it within reach for anyone who doesn't want to spend £40+ on a clinical-grade device they found on a pharmacy shelf.

It's not the last thermometer you'll ever buy if you're serious about fertility charting, but it's an excellent starting point. For everyone else — young families, general health monitoring, travel kits — it does the job without complaint.