This Meter has done its job: it shows the instantaneous fuel consumption and over time, allowing you to identify energy-efficient appliances in your home. The display, a little small, do not allow a reading of "altitude": If the power meter is connected to a low connection make you fall. Unlike other products of the same type, it works even with very small consumption (1 or 2W). Others, less than 5W, show 0! You can use it to measure the consumption of appliances on standby. Conclusion: I recommend!