The C9536/H9535 series are UV power meters that directly measure UV light at specific wavelengths. The H9535 (sensor head) uses a UV sensor (phototube) that ensures stable UV measurement over a long period of operation and is calibrated in combination with the C9536 (controller) based on national standards. The detachable sensor head contains a rechargeable battery for UV detection and data memory, allowing remote measurement such as on a belt conveyor or in locations where cable routing is difficult. In addition to external control via the RS-232C interface, an analog control is available for recording on a data recorder, etc.