光电直读光谱仪的优点是：分析速度快；准确度高，相对误差约为1%；适用于较宽的波长范围；光电倍增管对信号放大能力强，对强弱不同谱线可用不同的放大倍率，相差可达10000倍，因此它可用同一分析条件对样品中多种含量 范围差别很大的元素同时进行分析；线性范围宽，可做高含量分析。缺点为：出射狭缝固定，能分析的元素也固定，也不能利用不同波长的谱线进行分析；受环境影响较大，如温度变化时谱线易漂移，现多采用实验室恒温或仪器的光学系统局部恒温及其他措施；价格昂贵。
The advantages of the photoelectric direct reading spectrometer are: fast analysis speed; high accuracy, relative error of about 1%; suitable for a wide range of wavelengths; the photomultiplier tube has strong signal amplification ability, and can use different magnification for different spectral lines, with a difference of up to 10000 times, so it can use the same analysis conditions for a variety of samples The elements with wide range are analyzed at the same time; the linear range is wide and can be used for high content analysis. The disadvantages are: the exit slit is fixed, the elements that can be analyzed are fixed, and the spectral lines of different wavelengths can not be used for analysis; the spectral lines are greatly affected by the environment, such as the temperature changes, which are easy to drift, and now the laboratory constant temperature or the local constant temperature of the optical system of the instrument and other measures are mostly used; the price is expensive.