Strenght, extraction, TDS - what? Read the blog "How to measure extraction of coffee" and you'll find out.
Coffee Extraction and the Ideal Brew
Brew temperature, at fixed brew strength and extraction, has little impact on the sensory profile of drip brew coffee
How to Measure Drip Coffee: The Ultimate Guide for Precision Brewing
Immersion vs. Percolation: Have We Been Calculating Extraction Incorrectly? — Scott Rao
Systematically Improving Espresso: Insights from Mathematical Modeling and Experiment - ScienceDirect
Espresso Extraction Time: How to Calculate the Extraction Time
CoffeeStrides: Why Do We Measure Everything: Extraction Yield vs. Strength in Coffee
How to Make Tasty Commercial Cold Brew Using TDS and Extraction Percentage
Relationship Between Coffee Extraction and Ground Coffee Size