OT 20 Basal Thermometer for Ovulation Tracking – Beurer

The most precise way to track your cycle — measuring to two decimal places to detect the subtle temperature shifts that confirm ovulation.

The Beurer OT 20 is a precision basal body thermometer designed specifically for women tracking their cycle and planning pregnancy. Unlike a standard thermometer, it measures to two decimal places — sensitive enough to detect the small post-ovulation temperature rise that confirms you've ovulated. Combined with the Ovy app for structured cycle charting, it's one of the most affordable, accurate, and trusted tools used by women worldwide on their TTC journey.

A small device that gives you something invaluable: real, evidence-based insight into your own cycle.

Who It's For

• Women trying to conceive who want to confirm ovulation has occurred
• Women using natural family planning or fertility awareness method (FAM)
• Women with irregular cycles who want to better understand their patterns
• Women preparing for IVF or IUI who want to track their natural baseline
• Women wanting to chart their cycle for medical or wellness reasons
• Women who prefer a structured, data-driven approach to TTC

Key Benefits

• Measures to two decimal places for accurate detection of post-ovulation temperature rises
• Flexible tip for comfortable oral or vaginal use during daily morning readings
• Compatible with the Ovy app for structured cycle tracking and charting
• Waterproof and easy to disinfect — hygienic for everyday use
• Portable with a protective cover — works just as well when travelling
• Reliable, doctor-trusted brand with global reputation
• Affordable entry into structured cycle tracking

What's in the Box

• Beurer OT 20 Basal Thermometer
• 1.5V battery (already installed)
• Protective storage cover
• Detailed instruction manual

How It Works — Simple Science

After ovulation, your body releases progesterone, which causes a small but measurable rise in your basal body temperature (typically 0.2–0.5°C). This shift is too subtle to detect with a standard thermometer, but a precision basal thermometer like the OT 20 — measuring to two decimal places — can pick it up easily.

By taking your temperature at the same time every morning before getting out of bed, you build a chart that shows the moment ovulation has occurred. Over a few cycles, patterns emerge:

Confirmation of ovulation — the post-ovulation temperature rise tells you whether (and when) you ovulated each cycle.

Identifying your fertile window — combined with other tracking tools (like ovulation predictor kits or cervical mucus changes), you can identify your most fertile days.

Spotting cycle issues early — short luteal phases, anovulatory cycles, or irregular patterns become visible — useful information to share with your fertility specialist if needed.

The result: real, evidence-based insight into your cycle — not guesswork.

How to Use

Place the thermometer in your mouth for 2 minutes before switching it on. Measure at the same time every morning, ideally before getting out of bed, to ensure consistent baseline readings. Log your results manually in the Ovy app (or your preferred cycle tracking app).

⚠️ Note: The OT 20 is not Bluetooth-enabled — readings need to be entered into the app manually.

Tracking Tips

• Take your temperature at the same time each morning, ideally before any movement
• Aim for at least 4–6 hours of unbroken sleep before measuring for the most reliable readings
• Track for at least 2–3 full cycles before drawing conclusions about your patterns
• Consider tracking alongside ovulation predictor kits (OPKs) for a fuller picture of your fertile window
• Keep a note of factors that might affect your reading: illness, poor sleep, alcohol, or significant stress

Quality & Safety

• Precision measurement to two decimal places
• Flexible tip for comfortable oral or vaginal use
• Waterproof and easy to disinfect
• Trusted by women worldwide for cycle tracking and TTC
• Backed by Beurer, a globally respected medical and wellness device brand
• Pairs beautifully with ovulation predictor kits (OPKs), fertility supplements, or any structured TTC routine

Important: The OT 20 is a tracking tool, not a diagnostic device. Readings can be affected by illness, poor sleep, alcohol, stress, or shift work. If you have concerns about your cycle, ovulation, or fertility, please consult your healthcare provider or fertility specialist for proper investigation and guidance.

What Customers Say

★★★★★ "Reviews coming soon — be one of the first to share your Beurer OT 20 experience and help other women on their fertility journey."

★★★★★ "Have you used the OT 20? Leave us a review — we'd love to hear how it's helping you understand your cycle."

Frequently Asked Questions

Who should use a basal thermometer? Women trying to conceive, women using natural family planning, women with irregular cycles wanting to understand their patterns, and women preparing for IVF or IUI who want to track their natural baseline.

How long do I need to track for? Most women see their patterns clearly after 2–3 full cycles of consistent daily tracking. The longer you track, the clearer your patterns become — and the more useful the data is for understanding your fertility.

Is it Bluetooth-enabled? No — the OT 20 is a manual thermometer. You'll need to log your readings into the Ovy app (or your preferred cycle app) by hand. This is by design, keeping the device affordable, reliable, and battery-efficient.

Can I use it orally or vaginally? Both. The flexible tip allows comfortable measurement either way. Some women find vaginal readings slightly more consistent, but oral readings work well for most. Choose one method and stick with it for consistency.

What can affect my readings? Several factors can shift your basal body temperature: illness, poor sleep (less than 4 hours), alcohol, significant stress, shift work, or jet lag. Note these in your chart so you can interpret your data accurately.

Will it help me get pregnant faster? A basal thermometer doesn't increase fertility directly — but it gives you crucial information about whether and when you're ovulating. Combined with timed intercourse and supplements, it can help you make the most of each cycle.

Can I use it instead of an ovulation predictor kit (OPK)? They actually complement each other beautifully. OPKs predict ovulation 24–36 hours before it happens. Basal thermometers confirm it has occurred. Used together, they give you a complete picture of your fertile window.

Is it safe and easy to clean? Yes — the OT 20 is waterproof and can be wiped down or rinsed with mild soap and water. The protective cover keeps it clean between uses.

Important: This product is a wellness tracking tool and is not intended to diagnose, treat, cure, or prevent disease. Please consult your healthcare provider or fertility specialist if you have concerns about your cycle, ovulation, or fertility.