Style: phosphate light and small analysis set. This is an extremely small container that fits in the palm of your hand (approximately 2.2 inches (55 mm) from the nozzle to the recharging chamber, so it is lightweight without being bulky. Simply suck and shake the water to operate. After absorbing and shaking the reagent container, it reacts within 10 seconds to minutes. 1 simple pack is used for each measurement. 48 simple packs and 4 color charts per box. No need for anything except the simple pack and the included color chart. Just compare the color measurement with the included color chart to determine the quantity you get. No experience or expertise needed for measurements. It only absorbs water and compares colors, so it doesnt require professional experience or knowledge. Note: Due to the influence of coexistences found in water inspection, measurements may not be possible or may occur. Please contact us for more information.