This model uses the photoelectric effect to determine Planck's constant. The apparatus contains voltmeter and nano-ammeter (with built-in measurement amplifier). The photocell has a cesium coated cathode.
The light source consists of five replaceable LEDs. The LEDs are marked with their wavelength and are mounted in a black plastic housing which ensures easy optical connection to the photocell, without risk of ambient light disturbing the measurements. This model yields very precise results.
Supplied with a mains adapter.
Size (WxHxD): : 280 x 120 x 160 mm
Weight: approx. 1 kg