Hand-Arm Vibration (HAV) exposure is a health concern that affects thousands of workers across the UK, particularly those using power tools or machinery on a regular basis. Whether you’re a seasoned professional or a DIY enthusiast, understanding HAV testing results is essential for staying safe and making informed decisions.
What Is HAV Testing?
HAV testing measures the level of vibration a tool produces during typical use. These vibrations can affect the hands and arms over time, leading to serious conditions such as Hand-Arm Vibration Syndrome (HAVS) and carpal tunnel syndrome.
Manufacturers and employers often carry out HAV testing to ensure tools meet safety standards and to help users manage their exposure in line with the Control of Vibration at Work Regulations 2005.
Why Does It Matter?
Prolonged exposure to vibration can cause numbness, tingling, loss of grip strength, and permanent damage. HAV testing allows users to:
- Compare tools based on vibration levels
- Plan tool use to stay within safe exposure limits
- Comply with workplace regulations
- Protect long-term health
Even casual or occasional users benefit from understanding the risks, especially when using heavy-duty or older tools.
Interpreting HAV Test Results
HAV results are usually presented in metres per second squared (m/s²) and can be used to calculate exposure points over time using the HSE’s recommended system. Here’s how to make sense of what you see:
| Vibration Level (m/s²) | Exposure Threshold | Meaning |
|---|---|---|
| Below 2.5 m/s² | Low risk | Safe for extended use |
| 2.5 – 5 m/s² | Moderate risk | Monitor use and plan breaks |
| Above 5 m/s² | High risk | Limit use and consider alternatives |
Based on guidance from the HSE’s Control of Vibration at Work Regulations.
Practical Example
Let’s say you use a cordless angle grinder rated at 6.0 m/s². According to HSE guidelines:
- The Exposure Action Value (EAV) is reached after roughly 45 minutes of use.
- The Exposure Limit Value (ELV) would be reached after 2 hours.
This means you should take frequent breaks, reduce tool use where possible, or alternate with lower-vibration tools to stay within safe limits.
Critically, this appoach changes if you are the using a selection of tools as the overall trigger time impacts on the above exposure times. (trigger times should be combined to establish cumulative values)
Tips for Everyday Users
- Check tool specs before use – reputable sellers and manufacturers often publish HAV data.
- Use anti-vibration gloves – they reduce impact but don’t eliminate the risk.
- Keep tools well-maintained – worn parts or poor lubrication increase vibration.
- Switch tasks throughout the day to minimise exposure.
- Record usage if you’re regularly working with tools – especially important for employers or tradespeople.
Final Thoughts
Understanding HAV testing results empowers you to use tools more safely and confidently. You don’t need to be an expert – just a basic awareness of vibration levels, exposure limits, and good working practice can go a long way in protecting your health.
If you’re unsure about the HAV performance of a particular tool, contact us at Power Tool Sales. We offer HAV testing services and can help you choose the right equipment for safer, more efficient work.