Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless

The display on the device is barely visible when it is even working at all. I can't believe anyone would sell a product his bad. Even when I'm able to squint and see the numbers, it often doesn't work. I thought it might be my understanding of the product but even when reading the instructions and following them closely it just doesn't work. I would try several times, over and over again and still there is no way this device is working right.Sometimes I'll get a body fat percentage that I can see, but when I'm able to repeat the test the numbers are completely different. I either have extremely low body fat or I'm obese. Makes me wonder if the product is just a random number generator.Do not buy this product.