Replacement protective cap Daysy 2.0

Daysy measures your basal body temperature (BBT) with a precision of 0.02°C (0.04°F). That level of accuracy is only possible when the sensor stays clean and undamaged. Without the protective cap, dust can settle on the sensor tip or the delicate measurement head can get scratched during travel or storage — both of which can compromise your readings over time. The sensor cap snaps securely into place and removes easily: take it off before your morning temp check, put it back on when you're done. That simple daily habit protects the technology you rely on every day.

Only use the genuine Daysy replacement part. A proper fit is essential — an ill-fitting cap can create pressure points on the sensor and lead to inaccurate BBT readings. The replacement sensor cap for Daysy 2.0 was designed and tested specifically for this model. Whether your cap cracked, got lost, or simply needs replacing after regular use, this is the right part. Make sure to order the correct version for your device — Daysy 1.0 uses a separate sensor cap.

Daysy is an FDA-registered medical device, developed in Germany since 2014. Its algorithm is clinically validated with 99.4% accuracy. To keep your device performing at that level, stick with genuine OEM replacement parts.