YJINGRUI Digital LED Meter Optical Sensor for Automatic Conveyor Belt 6 Digit 0-999999 Induction Distance 10 mm : Amazon.de: Business, Industry & Science
Optical particle counter - OPC-6510 - Cubic Sensor and Instrument Co.,Ltd. - for clean rooms / remote / online
Airborne particle counter without display - PM5000S - Cubic Sensor and Instrument Co.,Ltd - laser / optical