六台台式和四台便携式浊度计的仪器间可变性 使用四种校准材料进行评估，包括用户制备的formazin，商用 甲嗪、市售稳定甲嗪和市售聚苯乙烯乳胶悬浮液 微球。校准方法/材料、光源类型和使用 仪器的比率测量功能对一致性没有显著影响 在这些仪器中。然而，研究结果将这些仪器分为两组。这个 A组中的仪器不是自动设定预定读数的仪器 校准期间将低颗粒（稀释）水样品放入仪器时 程序B组中的仪器使用校准程序自动设置 零或0.02 ntu时的低粒子读数。这两组都包括便携式仪器 以及不同类型的光源。浊度范围约为0.01-0.5 ntu （由A组仪器测量），A组仪器的平均读数约为 比B组高0.1-0.3 ntu。 包括22个参考文献、表格和图表。

The interinstrument variability of an assortment of six bench-top and four portable turbidimeters was evaluated using four calibration materials, including user-prepared formazin, commercial formazin, commercial stabilized formazin, and commercial suspensions of polystyrene latex microspheres. The calibration method/material, the type of light source, and the use of an instrument's ratio-measurement feature did not have a significant effect on agreement among the instruments. However, the results divided the instruments into two groups. The instruments in group A are those that do not automatically set a predetermined reading when a sample of low-particle (dilution) water is put in the instrument during the calibration procedure. The instruments in group B use the calibration procedure to automatically set the low-particle reading at either zero or 0.02 ntu. Both groups include portable-type instruments and different types of light sources. Over a turbidity range of approximately 0.01-0.5 ntu (measured by the group A instruments), the mean readings for group A instruments were about 0.1-0.3 ntu higher than those for group B. Includes 22 references, tables, figures.