Laboratories
ATR Unit TR-3K
- Ref. No: SA/BL/4/23
- Format: Object
- Date: [late 20th century]
- Level: Item
- Extent: 1 item
- Access: Open
Attenued total reflectance unit: black rectangular metal unit with three, small, vertical mirrors on the surface moved by a dial on the bottom. It comes with ten accessories and is held in a customer made wooden box.
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