Key benefits and purpose - Simple two step protocol to prepare a calibration solution using readily available lab items - Reusable calibration solution reduces waste and operating costs - Clear dilution to the mark ensures consistent solution concentration for reliable measurements - Compatible with standard lab equipment: 250ml hip flask and plastic bag - No CO2 in the diluent water helps maintain solution integrity Step by step instructions - Step 1 Cut the plastic bag Pour the powder into a 250ml hip flask Rinse the inner wall of the plastic bag with a small amount of distilled water without CO2 Dilute the rinse water to the mark in the hip flask and shake it well - Step 2 The calibration solution can be reused without pollution Key specifications and attributes - Function: Preparation of a calibration solution for measurement instruments - Capacity/size: 250ml hip flask - Material context: plastic bag used for powder handling; hip flask used for dilution and storage - Performance: simple two step process yields a usable calibration solution; shaking ensures thorough mixing - Reusability: calibration solution can be reused without pollution 2-3 practical use scenarios - Instrument calibration in a quality control laboratory where a clean, repeatable calibration solution is required - On-site or field calibration of portable measurement devices using only a 250ml hip flask and a plastic bag - Routine calibration workflow in research and development environments to maintain consistent measurement accuracy Notes on compatibility and workflow - Designed for use with a 250ml hip flask and standard plastic bag handling - Distilled water without CO2 is required for the dilution step to maintain solution integrity - The process emphasizes clean handling and proper dilution to the marked level for repeatable results