The best replacement for spectrophotometer is spectrometer.

The best alternatives to spectrophotometer are rated as following:
★★★★★  spectrometer
★★★★  colorimeter
★★  densitometer
★★  fluorometer
★  photometer
★  spectrofluorometer
★  nanodrop
★  plate reader
  double beam
  hemocytometer
  spectroradiometer

Your alternative for spectrophotometer is not listed? Suggest!
Speaking about spectrophotometer, one probably shouldn't forget about cuvette.

Other search terms related to spectrophotometer and their ratings are:
★★★★★ cuvette
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spectrophotometer
spectrometer
colorimeter