Testo’s 0635 0551 Digital Lux probe assesses the illuminance according to the V-lambda curve, which corresponds to the sensitivity of the human eye in daylight. White or warm light LEDs (K< 5,000) are able to be measured quickly and easily. The 0635 0551 is constructed with a 1.4m cable length allowing the probe to be placed directly at the location so users can carry out measurements from an acceptable distance eliminating the risk of readings being affected by shadows. Users can input measurement time and cycle allowing reading trends to be recorded. A user-friendly measurement menu and intuitive operation saves both time and effort.