Proving Units

A proving unit is a portable device that’s designed to be used a two-pole tester, to verify the safe operation of voltage testers such as multimeters and clamp meters and the accuracy being maintained. As we strongly advise to calibrate such products, when used in combination with a proving unit peace of mind will be made to ensure accuracy is maintained between calibration intervals. Able to test voltages from AC and DC instruments, whilst reducing the risk of a shock or arc flash by validating the testing equipment.

What are the types of Proving Units?

As we know the proving units are portable making them easy to transport and use in many environments, however there are many varieties of proving units to accommodate the vast voltage ranges of electrical equipment. For example, low voltage proving units such as the Martindale PD240 can test voltages up to 240V, great for residential appliances. If you need something capable of testing high voltage testers, then the Martindale PD690 kit is a great option by testing voltages from 12V to 700V and with a proving unit accompanied by a voltage tester in a neat carry pouch.

Proving unit can supply a range of voltages to the two pole voltage testers to ensure a thorough test at the applied voltages. An LED light is the sign that the two-pole voltage tester is functioning correctly, allowing you to proceed with your job. Like most devices in a toolbox or bag they can be susceptible to dust, water and general knocks, that’s why it’s important to maintain a testing schedule of your voltage testers. As these aspects can affect the accuracy of voltage testers and if inaccuracies aren’t noticed then this is when safety is in doubt. RS Components offers an in-house calibration service (RSCAL) prior to delivery, but also offers a yearly service for these products.

Why Choose RS Components for a Proving Unit?

Whether you’re an electrician or another professional, then RS Components has a comprehensive range of Proving Units and Proving Unit Kits to choose from leading brands such as Martindale, Fluke, Black Star and Megger. On hand advice from our technical experts to aid your decisions and our inhouse calibration service.


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Description Price Test Current Rating Output Voltage Display Type Battery Type Calibrated Power Source Dimensions Weight Height Length Maximum Operating Temperature Minimum Operating Temperature Model Number p Plug Type
RS Stock No. 193-8692
BrandRS PRO
£54.23
Each
Units
0.03mA 12 → 1000V ac/dc LCD AAA - Battery 73 x 34 x 240mm 237g 240mm 73mm +55°C -10°C - -
RS Stock No. 781-8760
Mfr. Part No.RSVIDP138
BrandMartindale
£205.19
Each
Units
3.5mA 440V LED AA RSCAL Mains 205 x 67 x 27mm 130g 27mm 205mm +55°C -10°C - -
RS Stock No. 782-4437
Mfr. Part No.RSVIDP138
BrandMartindale
£165.69
Each
Units
3.5mA 440V LED AA - Mains 205 x 67 x 27mm 130g 27mm 205mm +55°C -10°C - -
RS Stock No. 865-4756
Mfr. Part No.RSVIPD150
BrandMartindale
£195.10
Each
Units
3.5mA 700V LED AA - Battery, Mains 205 x 67 x 27mm 130g 27mm 205mm +40°C -10°C - -
RS Stock No. 192-5870
Mfr. Part No.RSVIPD150
BrandMartindale
£266.10
Each
Units
- 700V LED AA RSCAL Battery, Mains 205 x 67 x 27mm 130g 27mm 205mm +40°C -10°C - -
RS Stock No. 898-8936
Mfr. Part No.FLUKE-T150/PRV240
BrandFluke
£325.00
Each
Units
0.005mA 6 → 690V LCD AAA RSCAL Battery 255 x 78 x 35mm 270g 35mm 255mm +45°C -15°C - UK GS38
RS Stock No. 901-0832
Mfr. Part No.FLUKE-T150/PRV240
BrandFluke
£232.00
Each
Units
0.005mA 6 → 690V LCD AAA - Battery 255 x 78 x 35mm 270g 35mm 255mm +45°C -15°C - UK GS38
RS Stock No. 719-0894
Mfr. Part No.RSPD690
BrandMartindale
£99.00
Each
Units
- 700V - AA - Battery 143 x 84 x 50mm 400g 50mm 143mm +40°C -10°C PD690 -
RS Stock No. 716-1086
Mfr. Part No.RSPD690
BrandMartindale
£138.50
Each
Units
- 700V - AA RSCAL Battery 143 x 84 x 50mm 400g 50mm 143mm +40°C -10°C PD690 -
RS Stock No. 192-5869
Mfr. Part No.RSVIPDLOK150
BrandMartindale
£340.61
Each
Units
3.5mA - LED AA RSCAL Battery, Mains - - - - +55°C -10°C - -
RS Stock No. 865-4759
Mfr. Part No.RSVIPDLOK150
BrandMartindale
£269.61
Each
Units
3.5mA - LED AA - Battery, Mains - - - - +55°C -10°C - -
RS Stock No. 735-6091
Mfr. Part No.PD440
BrandMartindale
£140.50
Each
Units
- 440V - AA RSCAL Battery 143 x 84 x 50mm 400g 50mm 143mm +40°C -10°C PD440 -
RS Stock No. 740-1479
Mfr. Part No.PD440
BrandMartindale
£91.00
Each
Units
- 440V - AA - Battery 143 x 84 x 50mm 400g 50mm 143mm +40°C -10°C PD440 -
RS Stock No. 881-2775
Mfr. Part No.PRV240
BrandFluke
£129.00
Each
Units
- - - AA - Battery 117 x 74 x 28mm 200g 28mm 117mm +50°C -10°C PRV240 -
RS Stock No. 879-8770
Mfr. Part No.PRV240
BrandFluke
£172.50
Each
Units
- - - AA RSCAL Battery 117 x 74 x 28mm 200g 28mm 117mm +50°C -10°C PRV240 -
RS Stock No. 704-7740
Mfr. Part No.SP200
£88.40
Each
Units
36mA 50 → 690V - AA - Battery 130 x 65 x 49mm 350g 49mm 130mm +40°C -10°C SP-200 -
RS Stock No. 704-8712
Mfr. Part No.SP200
£137.90
Each
Units
36mA 50 → 690V - AA RSCAL Battery 130 x 65 x 49mm 350g 49mm 130mm +40°C -10°C SP-200 -
RS Stock No. 781-8785
Mfr. Part No.VIPDLOK138
BrandMartindale
£273.81
Each
Units
3.5mA 50 → 600V ac/dc LED - RSCAL Mains 205 x 67 x 27mm 130g 27mm 205mm +55°C -10°C - -
RS Stock No. 782-4430
Mfr. Part No.VIPDLOK138
BrandMartindale
£234.31
Each
Units
3.5mA 50 → 600V ac/dc LED - - Mains 205 x 67 x 27mm 130g 27mm 205mm +55°C -10°C - -
RS Stock No. 860-6735
Mfr. Part No.RSSMKIT5
BrandMartindale
£232.35
Each
Units
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