Terumo's basal body thermometer. Purchased new and used for about six months. The instruction manual is missing. Operation has been confirmed, and the thermometer has been disinfected with alcohol. The battery will be sent as is, so you can use it immediately, but the remaining battery life is unknown. There is no significant damage or malfunction, but please refrain from purchasing if you are sensitive to used items. Excerpt from the official website: ------------------------------------- WOMAN℃™ Terumo Women's Thermometer C531 Accurate measurement in approximately 20 seconds. [Measurement method: Predictive (predictive and actual measurement)] A basal body thermometer that can be washed with water. The main unit and case can be washed with water, so you can keep it clean at all times. Backlight and easy-to-read LCD characters. The backlight turns on when you press the switch. You can check the measurement value even in a dimly lit room.