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Optek 312 Dual Channel Absorption Meter W/ Single Wavelength F45 Sensor 280 nm | eBay
Optek Danulat Model 316 Dual Channel Absorption Meter w/ Screen Cover - Used - Motion Constrained Surplus
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Optek Danulat Model 316 Dual Channel Absorption Meter w/ Screen Cover - Used - Motion Constrained Surplus
Vintage Light Meter 💙💛 Exposure Meter Photographing ОПТЕК Soviet USSR Optek | eBay
Light Meter Optek 1960s Soviet USSR Exposure Light Meter - Etsy
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