Molded in a black phenolic case, this distinctive style meter with clear acrylic window provides wide-angle visibility and thin profile panel mounting. Available in 3-1/2" and 4-1/2" sizes, the Wide-Vue is ideal for reliable measurement of power from 10 to 3000 watts. Due to power dissipation, errors are usually prevalent in standard wattmeters at low values of power. This error is corrected in Simpson’s Compensated Wattmeters. Standard wattmeters have a single phase accuracy of ±2% of full scale (F.S). Compensated wattmeters have an accuracy of ±3% of full scale. Wattmeters have the Simpson dynamometer movement that is calibrated for either magnetic or non-magnetic panels and for a frequency range of 25-125 Hz. The dynamometer movement is air-damped, utilizing the same high quality pivots and jewels as the other fine Simpson meters to support the moving element.