Profile: Clark-Hess Communication Research manufactures precision testing and measurement equipments. Our products include sampling wattmeter, high frequency sampling wattmeter, high resolution phase angle voltmeter, gain phase analyzer, phase verification bridges, multifunction calibrator, transconductance amplifier and AC/DC voltage current calibrator. The model 2330 sampling watt meter is an auto-ranging watt meter which simultaneously measures & displays true rms voltage, true rms current and true mean power over a frequency range from dc to more than 600kHz. The full scale current & voltage inputs are typically measured within ±0.1 percent of the reading in amplitude to at least 400kHz. The corresponding power is typically measured to within ±0.1 percent of the input volt-amperes to 200kHz and to within ±0.2 percent of the input volt-amperes to 400kHz for loads of any power factor.