Proving Units
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£63.59 £52.99
- Test the functionality of non-contact voltage testers before and after use
- Indicates functionality via a visual LED alert
- Rugged design, drop tested from 1m
52 Reward PointsPrice Match GuaranteeKEWKTP1 -
£75.60 £63.00
- Compact and lightweight
- Suitable for proving high and low impedance instruments
- Inbuilt 200kΩ load limits the current to 3.5mA at 690V
63 Reward PointsPrice Match GuaranteePU690 -
£76.80 £64.00
- Single voltage output: 690V AC
- Applies full voltage upon contact
- Auto Power Off function
- Long battery life
64 Reward PointsPrice Match GuaranteeMARPD690S -
£77.94 £64.95
- Maximum output current of 2mA
- Maximum output voltage of 240V
- Compact body made from flame-retardant ABS for safety
64 Reward PointsPrice Match GuaranteeMARPD240 -
£80.40 £67.00
- Simple Design
- Robust Casing
- Magnet within the base
67 Reward PointsPrice Match GuaranteeKEWCB2 -
£93.60 £78.00
- 5 stepped nominal output voltages
- Automatic operation
- High output power suitable for test lamps
78 Reward PointsPrice Match GuaranteeMPU690 -
£100.80 £84.00
- 3 ranges
- Switchable AC / DC output mode
- Suitable for use with voltage indicators up to 230V
84 Reward PointsPrice Match GuaranteeMARPD230SRD -
£100.80 £84.00
- Step voltage indication
- First proving unit to generate an AC voltage waveform
- Compact design
84 Reward PointsPrice Match GuaranteeSP200 -
£106.80 £89.00
- Auto Power Off
- Lightweight, compact, and rugged
- Long battery life
- Low battery indicator
89 Reward PointsPrice Match GuaranteeMARPD440S -
£120.60 £100.50
- Compact and lightweight voltage-proving unit
- AC output up to 690V
- High- and low-Z impedance compatibility
100 Reward PointsPrice Match GuaranteeKANE-PU690V -
£121.20 £101.00
- Verify the functionality of multimeters, two-pole voltage indicators and non-contact voltage detectors
- Intelligent voltage ramp: 50V, 100V, 230V, 400V and 690V
- Able to synthesise tests at an AC mains supply frequency
101 Reward PointsPrice Match GuaranteeSP400 -
£123.60 £103.00
- Stepped voltages
- CALCHECK
- Auto Power Off function
- Low battery indicator
103 Reward PointsPrice Match GuaranteeMARPD440SX -
£126.00 £105.00
- CALCHECK
- Low battery indicator
- Long battery life
- Auto Power Off function
105 Reward PointsPrice Match GuaranteeMARPD690SX -
£130.80 £109.00
- Bespoke pouch means the kit can be carried on the user’s person
- Three-in-one voltage, continuity and phase tester
- Proving unit for maintaining compliance with safe isolation procedures
109 Reward PointsPrice Match GuaranteeDLPK6780 -
£133.20 £111.00
- 4 ranges
- Switchable AC / DC output mode
- Suitable for use with voltage indicators up to 440V
111 Reward PointsPrice Match GuaranteeMARPD440SRD -
£138.00 £115.00
- CALCHECK
- 4 ranges
- Compatible with S-series magnetic hanger
115 Reward PointsPrice Match GuaranteeMARPD440SRDX -
£141.60 £118.00
- Bespoke pouch means the kit can be carried on the user’s person
- Three-in-one voltage, continuity and phase indicator
- Proving unit suitable for testing high and low impedance instruments
118 Reward PointsPrice Match GuaranteeDLPK6790 -
£142.80 £119.00
- 5 ranges
- Switchable AC / DC output mode
- Suitable for use with voltage indicators up to 690V
119 Reward PointsPrice Match GuaranteeMARPD690SRD -
£150.00 £125.00
- Low-profile, durable proving unit
- 690V test voltage
- Heavy denier nylon case with a shoulder strap and clear front pocket
125 Reward PointsPrice Match GuaranteeMARPD690S-C -
£152.28 £126.90
- Performs TBT tests, providing a known voltage against which Fluke’s T6 Electrical Testers, FieldSense measurement function, and other high impedance products can be checked
- Simple-to-use single switch operation system with LED lights for functionality indication
- Protects the user from risks of shock and arc flash
126 Reward PointsPrice Match Guarantee4910310 -
£178.80 £149.00
- Generates both AC/DC voltage to 240V
- LED indicator
- Ideal for use with clamp meters and multimeters, as well as two-pole voltage testers
149 Reward PointsPrice Match Guarantee4566209 -
£178.80 £149.00
- PD440S: 440V industry-leading proving unit
- VI13800 Voltage tester range: 50V to 600V AC/DC
- TC71 Combination Carry Case
149 Reward PointsPrice Match GuaranteeMARVIPD138-S -
£179.40 £149.50
- KANE-VCT Voltage Tester
- KANE-PU690V Proving Unit
- Kit Carry Pouch
- Batteries
149 Reward PointsPrice Match GuaranteeKANE-VCTKIT -
£190.80 £159.00
- Ultimate solution for safety isolation procedures
- The KEWLOK padlock small size fits perfectly in pockets or tool kits
- KEWPROVE 3 works directly with the KT1795
159 Reward PointsPrice Match GuaranteeKEWISO3
About Proving Units
Proving units are portable, lightweight calibration tools that are designed for use with two-pole voltage testers. The function of a proving unit is to evaluate that the internal components of the voltage tester are working correctly and that measurement accuracy is maintained.
Although regular, formal calibration is still a priority, using a proving unit in combination with a two-pole voltage tester is an ideal way to ensure measurement accuracy is maintained in the period between official calibration procedures. Most manufacturers recommend that a proving unit is used both before and after testing using a voltage tester; this way, damage to the machine during transportation can be detected before testing, or damage to the machine during the actual testing procedure can be detected afterward.
Proving units come in many different forms to accommodate the vast voltage range spectrum that can be applied to two-pole testers. Some proving units might be designed for measuring low voltage testers, while others may be designed for higher voltage. Some may also be suitable for both low and high-voltage testers, measuring across the entire spectrum. A common function found on these units is ramp voltage. The proving unit applies several different voltages to the two-pole voltage tester that is inserted into ports on the proving unit and the device measures whether everything is working correctly with the applied voltage. The indicators are usually expressed via the use of LED lights and if everything is correct the LED light indicators should tell you that this is the case.
Stepped voltages again vary depending on the proving unit being used.
Using a proving unit to maintain accuracy is particularly important as frequent usage of a tester can result in the compromise of measurement accuracy. Other factors such as knocks and bumps, dust, water, and other forms of natural contaminants can also affect the accuracy of a tester over time and if these inaccuracies go unnoticed it can make the tester unsafe and also produce incorrect readings when used on a system.
Our range of proving units come from many different manufacturers, including Kewtech, Martindale, Megger, Seaward, and Socket and See. As mentioned earlier their capabilities vary from tester to tester, so knowing which unit you need before making a purchase is highly recommended. If you're confused about which unit you need we're more than happy to help you make a decision - get in touch and we'll help you out choosing the right proving unit for use with your voltage tester.