The HM Digital OP-STOR pH/ORP Electrode Storage Solution should be used to always keep your pH sensor wetted with a pH storage solution. If the sponge in your meter's cap is dry, re-wet the sponge so it is moist. If salt residue (white deposits) forms on the sensor or cap, wipe away with a tissue. The residue will not harm the meter or sensor.

Specifications:

• For use with the PH-200 or ORP-200
• Convenient size
• Bottle: Combination twist off and eyedropper style cap
• Made in Korea

Features:

• Total Volume: 60 cc
• Contents: Specially formulated KCl solution for pH and ORP electrodes (sensors)

NOTE: This solution is NOT for calibration. Do not use with a TDS/EC meter. Never touch the sensor with your fingers.