The Single-Phase Portable Reference Standard (SPRS) is a portable meter testing equipment used to test single-phase energy meters, also known as the meter under test (MUT). It uses both direct & clamp-on modes and supports static & electro-mechanical types of meters. It measures voltage, current, energy, phase angle, and more for the meter under test. It features a 5-inch inbuilt graphical colour display with a touch interface for user convenience. Additionally, it can be connected to a PC for further analysis. The SPRS has a storage capacity for up to 2000 test results.