Mobile handheld device for water level and temperature measurement in groundwater.The KLL-T has a sturdy aluminum frame and comfortable handle with which the device can be easily transported and operated. The built-in temperature reliably measures the water temperature with a high accuracy and resolution of 0.1° C. The KLL-T features an easy-to-use keypad with a large LCD. Even in bright sunlight or under diffuse light conditions, good legibility is always guaranteed. To determine the actual contact, an optical and acoustic signal is triggered upon immersion in water.