General Information Of The Gauge: There are two operating modes of UM-2D ultrasonic thickness gauge: standard mode and coating mode. The operating principle of coating mode is E-E (echo-echo). When there is coating or oil paint on the surface of the object, the net thickness of the material can be directly measured neither having to remove the coating nor calibration.  The operating principle of standard mode is P-E. With the covered coating, the measurement will not be very accurate, so the coating should be removed before measuring in standard mode. The advantage of this mode is that the measuring range is relatively wide: 0.031in-19.685in (with standard probe). 
 Operating principle: Pulse~echo mode(standard mode:for ordinary thickness measurement)   
                                      Echo~echo mode (coating mode:for net thickness measurement without removal of the painting)
﹡Multiple echo (ME) Thru-Paint models could measure the net thickness of a painted structure without having to remove the coating. 
 ﹡7built-in probe compensating lines 

Tech Data:

Operating principle	Ultrasonic pulse/echo method with dual-element probes
Measuring Range	0.8~300mm (standard mode) / 3~18mm (coating mode)      (Depend on the probe, materials and surface conditions)
Unit and Resolution	mm-0.01, 0.1/inch-0.001, 0.01
Material’s Velocity Range	1000~9999m/s,       0.0394~0.3937in/us
Linearity Error	H＜1in  ±0.002in or ±0.05mm
	H≥1in  ±0.5%H(H-the height of the analyte)
Display Screen	128*64 dot-matrix LCD(42*57mm）With EL backlight and switchable contract ratio
Probe zero adjustment (Selectable)	1-point calibration: normal measurement
	2-point calibration: curve surface measurement or other special application with a high precision
Data Storage	Divided 5 arrays, could store 500 thickness values
Minimum value checking	Move the probe along the surface of the testing material, UM-2D is able to automatically find the thinnest point.
Warning function	If the measured value exceeds the pre-set thickness limit, the warning tone will start.
V-Path Modification	Auto V beam path modification, could cover the nonlinearity for double crystal probe
Repeatability	±0.025mm or ±0.001in
Auto shut-off	Will shut off automatically after 5 min. of non-use
Working Temperature	-10℃～+50℃,+14℉ to +122℉ Specification to -20℃/-4℉ on request
Size	149×73mm×32mm (H×W×D)
Weight	200g (including batteries)
Power	Two 1.5V AA alkaline batteries
	Warning with low battery voltage
Measurement update rate	4 Hz in standard measurement mode
	25 Hz in MIN capture mode
Operating time	Up to 200 hours (without backlight) with alkaline batteries, depending on operating mode
Standard package	UM series thickness gauge
	Standard probe
	Carrying case
	Two 1.5V AA alkaline batteries
	Couplant
	Operating manual
	Certification of quality
	Packaging list
Optional accessories	Attachable rubber case
	Numerous special probes on request
	Couplants and high-temperature couplant
	4-step/6-step block for calibration
	Data transmission cable
	Application software