Power 15,000 volt piezoelectric generator. Discharge Bulb Flashes to indicate the instrument is operational. Clamping Mechanism Adjustable and self locking. Spring loaded - applies 10 lbs. of pressure. All metal parts are stainless steel. Temperature Range Operating: -20°C to +50°C (-4°F to +122°F). Humidity Range 0 to 90% Relative Humidity. Weight 245 g (8.6 oz.). Size 152.4 x 107.9 (at its widest point) x 22.2 mm (6 x 4.2 x .87 inches Warranty 1 year limited warranty.