Spectrometer Brass scale 7" AP-922B7 30 seconds or 1 minute
Spectrometer SS scale 7" Super abron AP-922S6 read by two opposite vernier cast Iron Powder coated base with leveling screws The lenses of collimator and telescope are achromatic. Ramsden eye piece with cross prism stand grating holder in wooden Box
AP-922-S7 Scale 7” Vernier 60sec or 30 secons stainless steel scale better and rustproof
AP-922-B7 Vernier 7 inch 30sec brass scale or 60 seconds 1minutes
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