Stand for Dual Combination Tester Measuring Voltage No Lower Resistance Limit 750 kilohm Wrist Strap Upper Resistance Limit 10 megohms Footwear Upper Resistance Limit 100 megohms Power Source 12VDC Certification NIST Calibrated Includes Pedestal Base Plate (5) 1/4-20 x 1/2 in Socket Head Screws (2) 10-32 x 5/8 in Phillips Head Screws (2) 10-32 Nuts (2) Spacers