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Adwa AD630 Information The Adwa AD630 is a heavy-duty, portable, waterproof meter for DO (dissolved oxygen) and temperature measurements. It is designed to provide laboratory results and accuracy even under harsh industrial conditions. The AD630 features a large, backlit LCD display that makes it easy to read measurements in any lighting conditions. It also has a data hold function that allows you to freeze the current measurement for easy viewing. The meter is powered by two AAA batteries, which are included. The AD630 comes with a galvanic DO probe, which is a type of probe that does not require any conditioning time when the unit is switched on. This saves time when many measurements are required. The probe is also waterproof, so you can use it in wet or humid environments.