It should have name plate details

Readings on the display must be readable

It should be tested and approved by the local EB authorities

It must have atleast 2 years warranty period

1.2 m

1.8 m

2.4 m

3.2 m

Higher than 1 ohm to 10 ohm

Should not be more than one ohm

Greater than 10 ohm to 100 ohm

Greater than 100 ohm

Not less than 1 m

Not less than 1.5 m

Not less than 2.0 m

Not less than 2.5 m

Not less than 2.0 mm

Not less than 2.5 mm

Not less than 3.15 mm

Not less than 6.5 mm