This document provides specifications for a double distillation water purification unit. It distills water to a conductivity of 1.0 μS/cm or less at 25°C for generating reagent-grade water. The unit is made of quartz glass with a 1.5 liter/hour capacity. It runs on 220V power and includes a metallic stand, ring clamp, and operation manual. Safety features include over-heating protection and indicators.