This Waterproof ORP Meter includes storage solution in a sponge embedded in a clear cap.
Digital ORP 200 Waterproof ORP Meter
This Waterproof ORP Meter includes storage solution in a sponge embedded in a clear cap. visit: https://www.ppe-mart.com/product/digital-orp-200-waterproof-orp-meter-999-to-1000-mv-orp-range/
