Silica Gel, moisture absorbent and desiccant will keep moisture from causing signal changes in junction boxes and instruments. Just put one or two packets of silica gel in each junction box, instrument and printer. Avoid corrosion problems due to moisture. Packets can be reactivated and used again. An absolute necessity in every truck scale junction box. Each packet contains 2 ounces (56 grams) of silica gel. Size 5" x 5" x 3/8".