Make colloidal silver yourself! Made in the U.S.A. with quality commercial grade components. The Colloid Master is professionally designed, engineered and constructed. Comes as a complete kit and includes: One Colloid Master AC, one 110 Volt AC power supply, one pair of 99.9 percent pure silver electrodes, one pair electrode connection wires, electrode cleaning pad. Easy to implement instructions. Features: Very easy to use and operate! Safe low voltage. Complete kit, just add distilled water and jar. Manufacturer direct pricing! It comes ready to use with silver electrodes and power supply. Adjustable PPM control. Automatic shut off. Attractive industrial enclosure. Portable, measures 2 1/4 inches high 4inches wide 7 inches long. Rugged commercial grade components. Makes one quart or one gallon batches. Reasonably priced! Reliable, trusted and perfected since 1998.Works with .999 silver electrodes 6 by 1/4 or 1/2 inch, 28 gauge. One pair of electrodes lasts about 1 year or more, depending on use. Electrokinetic stirring, no need for pumps or mechanical stirring. Specifications:Shipping weight 3 Lbs. PPM Range: 5- 20 ppm. Environment: 60 to 105 F (15.5 - 40.5 Celsius).Power Supply Input: 110 Volts AC, 60/50 HZ. Power Supply Output: 12 VAC 500 mA, center positive. The Colloid Master transforms power input into the optimal output level automatically. The current and voltage is modulated for optimal particle size dispersion for the ppm setting used. Particle size: The circuit of the Colloid Master is designed maintain a silver particle size of 0.1 to 0.001 microns, the majority of particles are concentrated in the 1 - 10 nm (nanometer) range. Particles that are smaller than 1 micron is the requirement to accurately match the true definition of being a colloid. A micron is one billionth of a meter. Colloid Master is a good choice, it comes with a 30 day money back satisfaction guarantee, as well as a 3 year warranty. Made in the U.S.A. Trusted and perfected since 1998.