If you suspect your earth impedance tester is giving suspect readings you can use a standard loop impedance tester to check it if you have one.
2 ohms sounds good as the target impedance, fingers crossed if you managed to get a much longer spike in the ground. I'd never normally give a rigid quote for installing earthing, it's way too unpredictable. Usually I offer a provisional costing based on experience of the area and an hourly labour rate but warn the customer it may be more or they could be lucky and it may be less.
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