The item shown is a BHO OM80 Obscuration Monitor, which is commonly used as a stack monitor.
- Manufacturer and Type: BHO Control Engineering Pty Ltd, Made in Australia.
- Model Number: OM80 (various versions exist, such as OM80 V 8.2 or OM80-HC12-V7).
- Power Specifications: Operates on 100-240V AC, 50VA.
- Functionality: Features a digital display with percentage (%) reading, alarm indicators (A1, A2), and a keypad for calibration (CAL), mode selection, and test functions.











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