The easy to use Checker plus is a real favourite with students due to it's clear LCD display and long thin pH electrode. The checker offers automatic calibration and buffer recognition calibrated buffer tags stability indicator low battery indicator and selectable automatic shut off. Ideal for measurements in test tubes and vials. The Checker plus provides users with fast accurate readings from 0 - 14 pH and has a resolution of 0.01 pH. The electrode can be easily replaced by simply unscrewing and screwing a new one in place. Low cost fast accurate and lightweight with 1000 hours battery life. Supplied with cleaning solution pH 4 buffer solution sachet pH7 buffer solution sachet.Storage solution sold separately (B8R06657).Replacement electrode is also available to purchase separately.