thickness gauge, advanced operating principle, more accurate and quickly test response,large measuing range SV-UM thickness gauge/gauge/thickness equipmentStandard package:SV-UM3 thickness gaugeStandard probe (single-crystal delayed probe)Carrying caseTwo 1.5V AA alkaline batteriesCouplantOperating manualCertification of qualityPackaging listOperating principle:I-E (interface-echo) mode with ...