Quicktest คำวิจารณ์

We calibrate and test every one before dispatch, using its own probe, so that we are certain it works perfectly. The probe tip won't be "black" but there will be some discolouration. So yes, the probe will give 4 or 5 tests fewer than if we hadn't checked it – but we ARE unique in that we check every one, and when we find one that doesn’t work to our satisfaction (it does happen!) we return it to the manufacturers.