Very few people I know who are "BMI Obese" are even relatively overweight. At worst they've got a bit of fluff. When you only calculate height vs weight, the amount of muscle you have is points against you so you can be a perfectly healthy person and the BMI chart will tell you you're Obese for having muscle.
Typically if someone is above the recommended BMI they are fat
You don't need a special test or equipment to tell either. Just look at them.
Very few people I know who are "BMI Obese" are even relatively overweight. At worst they've got a bit of fluff. When you only calculate height vs weight, the amount of muscle you have is points against you so you can be a perfectly healthy person and the BMI chart will tell you you're Obese for having muscle.