Damp investigations This information is only available to paying isurv subscribers. Additional equipment for stage 2 Pocket knife. Claw hammer and bolster (normally 65mm edge suitable). Access ladder for 3m height (a longer ladder may be... To continue reading, start your free trial here. Please note your trial does not include access to downloads. To explore our subscription options and access downloads, please click here. Or sign up to the isurv newsletter, your monthly round up of the latest isurv updates. For further questions, don't hesitate to call: +44(0)247 686 8555.