Some highly rated strapless heart rate monitors are the ePulse2 Strapless, the MIO Classic Select, the MIO Drive Petite, the Oregon Scientific SE138 and the Sportline Solo 925, as of 2015, states HRM Reviews Tips. These devices have electrocardiograph accuracy and other helpful features.
The ePulse2 is the only strapless heart rate monitor that continuously displays the heart rate. The others require touching a button. It only displays for three hours, but the battery is rechargeable. The MIO Classic is reliable and inexpensive, and it counts calories. The MIO Drive Petite is designed for women's wrists, and it also counts calories and displays percent of maximum heart rate, explains HRM Reviews Tips.
The Oregon Scientific SE138 is a water-resistant watch for swimmers that is also a stopwatch, calorie counter and clock. The pink Sportline Solo 925 is also a pedometer, accelerometer, stopwatch and clock, says HRM Reviews Tips.