Chemsolute techn. buffer pH 4.01, red, twin neck bottle, 250ml Back Catalog number: 1165-250ML Availability: In the manufacturer's stock Price on request - + Recommended 33665-500ML Buffer solution pH 4.0 (20oC) red colored, citric Price on request 33668-500ML Buffer solution pH 10.0 (20oC) violet colored, bor Price on request 33650-500ML Buffer solution pH 11.0 (20 oC) boric acid / sodiu Price on request