pH Buffer Solutions in 16.9oz (500mL) bottles for electrode calibration and care. Color-coded for easy identification. Kit includes 4.01, 7.00 and 10.00 pH. REED R1400-KIT Offers These pH Buffer Solutions are manufactured and ready to use in accordance with and traceable to NIST publication 260-53 (PB 248-127) to ensure quality and accuracy. Labels include a table to display what the pH value should be given the buffer solution temperature. Features 4.01, 7.00 and 10.00 pH Buffer Solution (25°C) 16.9 fl oz (500ml) bottles with viewing strip and childproof cap Color-coded for easy identification ±0.020pH accuracy Certificates of Analysis available upon request Included REED R1400-KIT pH Buffer Solution Kit, 4.01, 7.00 and 10.00 pH