Solutions pH 4 & 7

Calibration solutions in powder: lightweight, compact, economical and with an indefinite shelf life. It contains 6 sachets with pH4 and 6 sachets with pH7. Each sachet produces 100 ml of calibration solution (the contents of the sachet must be mixed with distilled or deionized water). Includes 100 ml bottle to prepare and instructions for preparation. Ideal for sending by mail or other means for its lightness and small size.