High-sensitivity probes, alloy probes and high-sensitivity glass electrodes, high accuracy in measuring water quality, automatic temperature compensation, reducing errorsHigh-definition backlit display, super large display, high-definition display value can be known at a testBuilt-in two 1.5V button batteries are durable and easy to replaceSelected solid crystal box packaging to effectively protect the product.Colour:blueMaterial:ABSPackage Contents:1 * BLUE PH test pen3 * calibration powder1 * English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.