Final answer:
A photometer is not used in a liquid oxygen particulate test; instead, a filter holder, pump, and in-line sampler are typically utilized for collecting and analyzing particulates.
Step-by-step explanation:
To perform a liquid oxygen particulate test, among the listed equipment, the one that is not typically used is C) Photometer. A photometer is generally used for measuring the intensity of light, which is not directly applicable for a particulate test in a liquid medium. Instead, the equipment commonly used includes a Filter holder to retain particles, a Pump to move the liquid through the filter, and an In-line sampler which is used to obtain samples of the liquid for testing. A typical setup for a liquid oxygen particulate test would involve filtering the liquid to collect and analyze the particulates.