min. convex radius: 1.5 mm min. concave radius: 25 mm min. diameter of the measurement area: 6 mm min. tested thickness: iron 0.5 mm, others 0.3 mm memory of the last 20 results high-resolution screen self-test function operating temperature: 0-40℃ operating humidity: 20-90%, relative humidity: <80% power supply: 2 AAA batteries, 1.5 V dimensions: 105 x 52 x 25 mm weight: 100 g