Hipotronics Portable Oil Dielectric Tester.
Your device is called an Oil Dielectric Tester.
It is a device used to test the dielectric strength of oils (like transformer oil).
In simple terms:
It measures the oil's ability to prevent electricity from passing through it without causing a spark or breakdown.
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• It continues to raise the voltage until:
• Spark (Breakdown)
• The device records the voltage value at breakdown (kV)
This value determines the quality of the oil 
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Device Functions:
Measuring dielectric strength (most important function)
• It tells if the oil is strong and insulates electricity or weak.
• The higher the value → the better the oil.
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Detecting oil problems
The device indicates if the oil contains:
• Water
• Impurities
• Oxidation or degradation
Because these things reduce insulation and cause failures 
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Protecting electrical equipment
Used to test:
• Transformers
• Switchgear
• Electrical cables
To prevent:
• Burning
• Short circuits
• Equipment explosions
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Periodic Maintenance
• Technicians use it periodically.
• It helps decide:
• Does the oil need changing?
• Or cleaning (filtering)?
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Its Importance:
If the oil loses its insulation:
• Electricity passes through it.
• A malfunction or explosion occurs.
That's why the device is very important in electricity companies and factories.
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• The device = electrical oil quality tester
• Its function = measures when the oil "breaks down" electrically
• The goal = protect equipment and prevent failures