I just tried measuring different stuff around the house with a Fluke AC ammeter, and most devices were right on the spot. Microwave at 2Kw, incandescent light bulbs were showing within 1w of their rating. Even the 12v outside lighting system showed perfect reading. Pretty accurate throughout the range of the meter in other words. The 2 devices that showed strange results were an 19" LCD display and several fluorescent energy saving lights. The monitor is rated at 49w average consumptions, while the meter showed a consistent 240w! The fluorescent bulb rated 15w(60w incandescent light output equivalent) pulled 55w! Are these type of devices trick the meter by their nature of operation or were they falsely advertised?