Work Surface Tester
ST-4
Surface Resistivity	103 ~1013 (Ω/sq. or Ω)
Mode	1.    Standard Mode (Ohm per square, Surface Resistivity) 2.    Mat surface – Mat resistance measurement Mode (Ohms, Resistivity to Ground) (w/cable) 3.    IEC Standard measurement Mode Follow the IEC standard probe (surface + weight)
LCD Display	Exponent display (one digit beyond the decimal point) Remaining measurement time by bar-graph indicator Remaining battery value
LED Display	1.    Test Green LED indicator: Standard Mode (Ohm per square, Surface Resistivity) Red LED indicator: Mat-Ground resistance measurement Mode (Ohms, Resistivity to Ground) and IEC standard measurement Mode 2.    Measurement voltage (10V, 100V) 3.    CHARGE Red LED indicator: in progress of charging
Measurement time	10 sec, 30 sec, 60 sec
Range	Can be set up the max and min of measurement value (by 0.5 exponent)
Accuracy	+/-0.5 decade (ex. 108.5 +/-0.5)
Measurement voltage	Automatically adjust/ change 1.    Cube of 3 to 6: 10V, 10mA max 2.    Cube of 6 to 13: 100V, 1mA max
Source	Inside battery
External outlet	1.    External probe connector 2.    AC adaptor connector (battery charging USB mini type)
Measurement are	50 mm (probe length) x 50 mm (probe distance) (in measurement)
Probe material	Special conductive rubber (volume resistivity 0.02Ω· cm max.)
Environment	15°C ~ 25°C, under 60% R.H.
Dimension	114 (W) x 78 (D) x 69 (H) max. (mm)
Case	Stainless steel
Weight	Body 700 g