To ensure that your stock valuation is accurate and consistent, you need to monitor and control your inventory levels and movements regularly. You can use tools and techniques such as stock counts, stock audits, and stock reports. Stock counts involve physical inspections of your stock to verify the quantity and condition of your inventory - you should conduct them periodically, such as monthly, quarterly, or annually. Stock audits are independent examinations of your stock and inventory records by external auditors or regulators - you should cooperate with them and provide the relevant documents and evidence. Stock reports are summaries of your stock and inventory activities - you should prepare and review them regularly, such as weekly, monthly, or quarterly. If there are any discrepancies, errors, irregularities, issues, or opportunities, you should investigate the causes, make necessary adjustments, correct them, implement recommendations, and take appropriate actions.