The REED R1410 provides a pH 10.00 calibration standard in a 500ml bottle, rounding out REED's buffer line for high-pH calibration points. Like its siblings, it's supplied ready-to-use with a childproof, viewing-strip cap, +/-0.020 pH accuracy, and NIST-traceable formulation. It's suited for calibrating pH/ORP meters such as the REED R3000SD series at the alkaline end of the scale.