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What specs? Do they give any?
DescriptionReport ItemDC 0-1000V 2000V 3000V 4bit high precision voltmeter digital display high voltage voltage meter 0.36 Inch 4 bit LEDTechnical parametersMeasuring range: 000.0-999.9V / 0000-2000V /0000-3000VInternal resistance: 10M Ω/ 20M Ω/30M ΩOperating temperatur e : -10℃~60℃Working voltage: DC5-12V *1Working current: <20mAMeasurement accuracy: 0.5%(+/-2)*2Measure the impedance: 20MΩRefresh rate: 3 times/secondThe net weight: 23gDisplay mode:4 bit 0.36 inch LEDDisplay color: Red, blue and green can be purchasedOverall dimensions:48MM*29MM*21MM(L*W*H)Opening size: 45.5mm*26.5mmLead wire length: 13CMWiring method: black public negative pole, red instrument power supply, white measurement port*1:The instrument can work in dc4-28v, but it will be hot when it is above 12V and reduce the accuracy and life. Please use 5-12V power supply.*2:In the worst case, the error is no more than 6mV. In general, the error is about 2mV.
That looks quite questionable to me. I suppose that if they removed one of the pins, then in theory they are juuuuust barely meeting the 1mm/kV rule of thumb, but that makes no allowances for any contamination, humidity, or anything.