Elcometer 331 Mk2 Basic BH Model Concrete Cover Meters

Product Description

An easy to use gauge that quickly and accurately locates/orientates reinforcement bars in concrete and measures the depth
of cover over the rebar.

Designed to meet IP65 this rugged waterproof gauge can be used in the harshest of environments

User Friendly

  • Easy to transport and store
  • Ergonomically shaped case for comfort
  • Single handed operation: All functions can be accessed & controlled through 4 simple keys/buttons


  • Locate and determine orientation of rebar quickly, easily & accurately
  • Up to 240,000 readings can be stored on the gauge for detailed reporting
  • Memory and data logging with data output to PC or direct to printer
  • Graph Plotting allows an immediate visual indication of results


  • Stainless Steel rebars can be located by the THD Model
  • Battery packs can be charged in the unit or externally. Additional batteries allow continued use


  • Specifically designed for use on-site
  • Rugged, waterproof IP65 case provides protection against the elements
  • Backlit screen for viewing in dark environments


  • Rebar locator, concrete covermeter and half-cell measurement all available in a single gauge – (selected models)
  • Intuitive menus enable each gauge to be used straight from the box


  • Links to Covermaster™ Software
  • Ultimate data management tool to store cover & half cell readings and produce professional reports
  • On Screen graphic display provides visual assessment of readings allowing identification of areas of low concrete
    cover or potential areas of corrosion

Cover Display Screen

• Alternative / Typical Data Review Screen View
• Backlit screens for use in dark conditions
• Easy to use menus, in multiple languages to enable access to all data needed whilst on site
• without constant reference to the instruction book
• Alternative view shows the typical display when using the deep cover search head
• Bar size and depth of cover can be input manually to suit specific requirements
• Typical data review screen clearly displays where readings are below or above a user
• specified tolerance, where a reading has not been taken
• Units of measurement can be displayed in mm or inches for cover, or mV for Half-Cell

Half-Cell Mode

• Typical Screen View
• Elcometer 331 Model BH/SH/TH/THD can read both Cover and Half-Cell Values
• Elcometer 331 Model B can read Cover Values only
• Data logging information displayed on screen
• Menu soft keys are visible in Elcometer 331 Model SH and TH

Graphics Plot Mod

• eHalf-Cell Mode – the gauge indicates the areas with the most potential for corrosion
• Covermeter mode – the gauge indicates the depth of cover
• Black indicates most potential for corrosion
• White indicates least potential for corrosion with varying greyscale shade in between
• Zoom feature allows the user to take a closer look at different areas that are of interes

Threshold View

• Ideal method for a simple pass or fail analysis
• Once the threshold value has been set, anything before the value is shown in black,
• while anything over the value is shown in white

Autosizing and Orthogonal Function

• Autosizing automatically estimates the size of rebar and the depth of cover
• If this estimated figure differs greatly from your expected rebar size or you do not know the expected rebar size, the orthogonal size function provides an of bar size
• accurate measurement
• The step by step directions for orthogonal function on the covermeter make the accurate
• sizing of bars quick and easy

Data Logging Feature

  • Simple Data Management on the Elcometer 331 Models SH, TH and THD
  • The Elcometer 331 Model SH can store up to 10 batches of 1,000 cover or half-cell readings, with batch statistics, ready for evaluation and report generation using Covermaster™ Software package
  • The Elcometer 331 TH and THD models have user definable memory batches with either linear or grid batch data logging modes. (Linear batching is where data is stored in a batch one reading after another)
  • Grid batches allow data to be stored in a ‘spreadsheet format’ with each cell relating to the survey area typically mapped out on the structure prior to inspection. The grid batch feature facilitates fast surveying for both cover and half-cell readings. Problem areas that do not fall within specification can be immediately identified and marked directly on the concrete
  • Cover and half-cell readings can be recorded and ‘overlaid’ in each grid location

Powerful Statistics Feature

  • Continually calculates and displays the statistical analysis of readings as they are taken. So, while the covermeter is in use, you are always informed and know exactly how your site survey is progressing
  • Statistics values are also calculated for the readings within each batch and these values are stored in the batch along with all individual readings


Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters – Specifications

Elcometer 3312 Gauges
Part Number Description
W331B—2 Elcometer 3312 Model B Covermeter (Supplied complete with Standard Search Head)
W331BH–2 Elcometer 3312 Model BH Covermeter with Half Cell (Order search heads or Half-Cell probes separately)
W331SH–2 Elcometer 3312 Model SH Covermeter with Half Cell (Order search heads or Half-Cell probes separately)
W331TH–2 Elcometer 3312 Model TH Covermeter with Half Cell (Order search heads or Half-Cell probes separately)
W331THD-2 Elcometer 3312 Model THD Covermeter with Half Cell (Order search heads or Half-Cell probes separately)
Elcometer 3312  Search Heads & Half-Cell
TW33119124-1A Elcometer 331Standard Search Head
TW33119124-2A Elcometer 331Narrow Pitch Seach Head
TW33119171A Elcometer 3312 Deep Cover Search Head
TW33119223-1A Elcometer 3312 Borehole Probe 0 -40cm
TW33119223-2A Elcometer 331Borehole Probe 0 – 100cm
TW33119223-3A Elcometer 331Borehole Probe 0 – 16″
TW33119223-4A Elcometer 331Borehole Probe 0 40″
TW331CUKIT Elcometer 331Half Cell Probe Kit Cu/CuSO4 (Cannot be used with Model B)
TW331AGKIT Elcometer 331Half Cell Probe Kit Ag/AgCl (Cannot be used with Model B)
TW33119688-1 Elcometer 331Half Cell Probe Cu/CuSO4 (Cannot be used with Model B)
TW33119688-2 Elcometer 331Half Cell Probe Ag/AgCl (Cannot be used with Model B)
TW33120014D Elcometer 331High Tensile and Stainless Steel Dual search head (Can only be used with the Model THD)
  Elcometer 331 Models
Description B BH SH TH THD
Covermeter / Rebar location
Half Cell measurement  
Rebar orientation
Depth of cover
Large cover (thickness) reading mm or inches
Large graphics display with backlight
Multiple language menu structure
signal strength bar
Interchangeable heads with LED & keypad
User selectable bar range sizes & numbers
Rugged waterproof case (IP65)
Adjustable beep volume & earphone socket
Measurement sound modes
Locate (tone increases as head approaches rebar)
Under Cover (tone only sound for low cover)
Maxpip (tone only as head passes rebar centre)
Half Cell capability  
Large half cell reading mV  
Autosize mode bar diameter determination    
Orthogonal mode bar diameter determination    
RS232 Output – direct to printer or PC    
EDTS Excel link software    
Covermaster software    
Minimum & maximum cover limits    
Date & time    
Linear batch memory No Memory No Memory 10 Linear batches of 1,000 readings each Up to 200 batches of 1,000 readings Up to 200 batches of 1,000 readings
Grid batch memory       Up to 240,000 readings Up to 240,000 readings
User certified batch size      
Graphics Plot      
Threshold plot      
Stainless Steel measurement mode        
Bar dimension range Click on the Bar Dimension Tab at the top for a range of Bar Dimensions
Rechargeable power supply 7.4V lithium ion battery pack provides up to 32 hours of continuous use (20 hrs if backlight is on). Rechargeable in 4 hours either inside or outside the gauge using an external charger.
Maximum operating temperature 50°C
Unit dimensions 230 x 130 x 125mm
Unit weight 1.54kg

Data Sheet

Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters – Data Sheet

Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters Data Sheet


Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters – Standards

The Elcometer 331 Mk 2 Basic Model Concrete Cover Meters can be used in accordance with:

  • ACI 318
  • ASTM C876
  • BS 1881:201
  • BS 1881:204
  • BS 8110
  • CP 110
  • DGZfP:B2
  • DGZfP:B3
  • DIN 1045
  • EC 2
  • SIA 162
  • SIS 2006
  • TR60
  • UNI10174


Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters – Accessories



Standard Search Head

Design to meet most of your measurement requirements.

Part Number



40mm bar – 15mm to 95mm

8mm bar – 8mm to 70mm


155 x 88 x 42mm

Sensing area

120 x 60mm

Narrow Pitch Search Head

Accurately measures the cover thickness when the gaps (pitch) between each of the rebars are close together.

Part Number



40mm bar – 8mm to 80mm

8mm bar – 5mm to 60mm


155 x 88 x 42mm

Sensing area

120 x 60mm

Deep Cover Search Head

The ideal search head for accurately measuring rebars that are deep within the structure.

Part Number



40mm bar – 35mm to 180mm

8mm bar – 25mm to 160mm


170 x 94 x 54mm

Sensing area

160 x 80mm

Dual Search Head for high tensile and stainless steels

The search head specifically designed to locate high tensile and stainless steel.

Part Number



40mm bar – 35mm to 180mm

8mm bar – 25mm to 160mm


170 x 94 x 54mm

Sensing area

160 x 80mm

Borehole Probe

Borehole Probe

The solution for locating tendon ducts and multiple layers of rebar lying deep within the concrete.

Part Number




TW33119223-1A Short

TW33119223-3A Short

TW33119223-2A Long

TW33119223-4A Long

Measurement depth

Short Probe: 0 – 40cm

Long Probe: 0 – 100cm

Approximate detection ranges

Tendon duct (70mm): up to 90mm

Half-Cell Kit

Consisting of either a copper electrode in a copper sulphate solution or a silver electrode in a sodium chloride solution, each half cell is a sealed unit – no need to mix chemicals. Supplied with a 25m / 80′ cable, every half-cell probe is guaranteed for 5 years.


Part Number

Copper/Copper Sulphate


Silver/Silver Chloride


Extension Cable 100m / 325ft

The extension cable for use with the half-cell kits gives the flexibility to take readings in difficult to reach areas.


Part Number


Verification Block

Verification Block

The verification block allows the user to check the calibration of their gauge in order to ensure maximum measurement accuracy.

Part Number


Extension Arm Kit

This kit allows the user to scan bridge decks and floor areas using the hand-held search heads from a standing position. Both the standard or narrow pitch search head can be attached to the extension arm.

Part Number


Bar Diameter

Elcometer 331 Concrete Covermeter Bar Diameter

Bar Size Dimensions

Metric   US Bar   ASTM/Canadian   Japanese  
Bar Size Diam. (mm) Bar Size Diam. (Inch) Bar Size Diam. (mm2) Bar Size Diam. (mm)
5 5 #2 0.25 10M 100 6 6
5.5 5.5 #3 0.375 15M 200 10 10
6 6 #4 0.5 20M 300 13 13
7 7 #5 0.625 25M 500 16 16
8 8 #6 0.75 30M 700 19 19
9 9 #7 0.875 35M 1000 22 22
10 10 #8 1 45M 1500 25 25
11 11 #9 1.125 55M 2500 29 29
12 12 #10 1.25     32 32
14 14 #11 1.375     35 35
16 16 #12 1.5     38 38
18 18 #13 1.625     41 41
20 20 #14 1.75     44 44
22 22 #15 1.875     48 48
25 25 #16 2     51 51
28 28 #18 2.25     57 57
32 32            
36 36            
40 40            
44 44            
50 50            

Instruction Manual

Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters – Instruction Manual

Elcometer 331 Mk 2 Basic BH Model Concrete Cover Meters Instruction Manual