Diameter 35mm, suitable for most installation scenarios The range is the largest in the D35 series and can measure application scenarios with large height differences, such as the height of the liquid level The special 90 degree light emitting lens, the -90C version can penetrate into holes with a diameter greater than 4mm, and has the largest measuring range of all 90 degree light emitting lens models, which is a special model that takes into account both small hole inner wall measurement and large measuring range