ZS-20C-V20series mini Optical Power Meter and red light all-in-one machine series are controlled by single-chip microprocessor but multifunction. It can be well protected by using embedded detector and laser. The whole machine has automatic shutdown function,three red light. An optical power meter (OPM) measures the power levels of light signals in devices that transmit data or power using light. This makes it ideal for applications that require multiple detectors in a small space.