The above comparison shows that “high” range probe setting gives lower values than “low” range probe setting. This could explain why manufacturers suggest “high” range probe setting only be used when “low” range probe setting could not measure concrete covers. In addition, the measured covers have significant errors, giving much lower readings than actual covers. Although by setting cover meter to “high” range can increase the maximum cover measurable depth, it is likely to introduce more errors at the same time. Proper correlation should be established prior to actual cover measurement if “high” range probe setting will be used.