Your heart rate is one of the most reliable indicators of fitness level. A heart rate monitor tells you your current heart rate. It will let you know when you've done that bit too much, or too little, exercise. There are some heart rate monitors that do not have a chest strap. These units measure the electrical stimulation of the heart through the finger tips. You will only get to HR reading when your fingers touch the sensors. A chest strap HRM is more beneficial as l It allows the user to set a training zone alarm and get on with the exercise. After the session the user can review average Heart rate, time spent in zone, calories burnt etc (depending on model).
click here to know more about this product Heart rate monitor can help you lose weight (fat loss aid) when used in conjunction with a sensible eating plan and exercise program. The ideal training zone for weight loss (fat loss) is, approximately, 60% -70% of your maximum heart rate. Programmable training zones help you Ensure that you spend most of your training session in the correct "zone". A heart rate monitor accurately controls the intensity and duration of your sessions. Pedometer
Pedometers are worn on the hip and based on your body's movements, your pedometer will count your steps. When you enter your stride length, the pedometer will calculate your distance walked and with your weight it can calculate the approximate number of calories burned. Once calibrated (by entering your average stride length) the pedometer gives reliable distance traveled information, as well as calories burnt (based on distance traveled, time, age, sex and weight).

You can also use your pedometer just to track your number of steps and distance / calories when taking walks