A transistorised solvent front detector.
D002854:Chromatography, Paper / Q000295:instrumentation*; D004581:Electronics; D005492:Folic Acid / Q000032:analysis; D012997:Solvents; D014805:Vitamin B 12 / Q000032:analysis
D012997:Solvents; D005492:Folic Acid; D014805:Vitamin B 12