It is a common point of confusion, but IEC 60606 does not exist.
It is highly likely you are looking for IEC 60601, the international standard for medical electrical equipment. A typo (repeating the digit '6' instead of '01') is the most common cause of this search error.
Here is a useful guide regarding the standard you are likely looking for, how to navigate it, and the reality of finding it as a PDF.
This paper provides a comprehensive overview of the IEC 60601 standard series, the primary international benchmark for the safety and essential performance of medical electrical equipment. As medical technology advances, the regulatory landscape becomes increasingly complex. This document outlines the history, scope, and structure of the standard, focusing on the transition from the 2nd to the 3rd edition, the implementation of Risk Management (ISO 14971), and the critical concept of "Essential Performance." It serves as a guide for manufacturers, engineers, and regulatory professionals seeking to understand the requirements for market access in the EU, USA, and globally.
Before you buy IEC 60606, check if your moisture meter manufacturer provides a summary of compliance in their manual. Many do, and that summary may contain the 80% of information you need for daily use. The full PDF is mainly necessary for:
Title: Medical electrical equipment - Part 1: General requirements for basic safety and essential performance.
This is the "gold standard" for medical device manufacturers. If you are designing, testing, or certifying a medical device that runs on electricity, this is the document you need.