• To identify the location and orientation of the rebar under the surface of the concrete, a search head is connected to the Covermeter and is used to scan across the designated search area of the concrete.
• When the search head approaches a reinforcement bar, the LED on the search head will start to glow. The Covermeter will start to emit a sound that will increase in pitch and the signal strength indicator bar on the display will increase in length.
• When the bar is positioned below the center of the search head then the pitch of the sound will be at its highest and the depth of coverage will be shown on the Covermeter display. The signal strength indicator bar is at its maximum.
• If the reinforcement bar is too deep to measure, the depth of coverage will be displayed as infinite.
• The Elcometer 331B Covermeter is an entry-level gauge without memory that is only used to quickly locate and measure the depth of cover over the rebar.
• Interchangeable Search Heads & Borehole Probes
• A range of fully interchangeable search heads and borehole probes are available to suit the requirements without the need to return your gauge to Elcometer.
• There are four types of search heads available for use with the Elcometer 331B; Standard, Narrow Pitch, Deep Cover, and Borehole.
• The Standard Search Head is designed to meet most of the measurement requirements whereas the Narrow Pitch Search Head accurately measures the cover thickness when the gaps (pitch) between each of the rebars are close together.
• The Deep Cover Search Head is ideal for accurately measuring rebars that are deep within the structure. The Borehole Probe is ideal for locating tendon ducts and multiple layers of rebar lying deep within the concrete.
• Changing from one type of search head to another is quick and easy; simply switch off the Covermeter, swap search heads, switch it on again, and zero the Covermeter.

Packing List: Elcometer 331B Covermeter, standard search head & search head connecting cable, rechargeable battery pack & charger (UK, US & EU), earphone, shoulder strap, plastic carry case & operating instructions.