TANITA Thermometer I bought this as a spare when my child entered nursery school. I rarely used it and kept it in the first-aid kit. The case has some scratches. The battery replacement mark is displayed, but the battery is included, so you can use it immediately upon arrival. The screen is large and easy to read. It has only one button, so it's easy to operate. The part that goes under the arm is made of silicone and bends, so it's safe for children. It has been disinfected. It can measure in about 10-20 seconds. It's the type that goes under the arm. It has a backlight that is easy to see in a dark room. A storage case is also included. The battery is a button cell battery that can be purchased at 100-yen shops or convenience stores.