YSI 580 [605129] Soft-Sided Carrying Case. The YSI 580 carrying case is a soft-sided, zippered case perfectly sized to fit the pH10A, ORP15A, or EC30A pen-style handheld instruments along with supplies. There is a Velcro strap to hold the pen in place and keep it from moving around. An open area allows for calibration reagents, spare parts, or miscellaneous. Elastic compartments will allow for containers to be filled with calibration solutions and kept in the case. A mesh compartment is designed to hold the instruction manual or other papers as needed. Sturdy nylon handles and shoulder strap provide easy carrying options.