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RADIOMETER CROOKŸ??S

RADIOMETER CROOKŸ??S

SKU PH0418B
Evacuated glass bulb have Black and White vanes in color. Mounted on round plastic moulded base.Comprising partly evacuated glass bulb approx. 70 mm diameter, containing at its centre a fine pivot which supports four light weight metal arms. One side of each vane is blackened, the reverse side is bright. Mounted on round plastic moulded base.
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