Battery Not Included: This set does not include a battery, ensuring you can use your existing compatible batteries without the need for additional purchases. Ideal for those who already own the DO9100 meter and are looking to replace or upgrade components. Chemical Safety: Contains no high-concern chemicals, making it a choice for both personal and professional environments. This feature ensures that you can use the product in sensitive settings without worrying about harmful substances. Enhanced Visibility: Equipped with a backlight feature, this replacement set for the DO9100 dissolved oxygen meter enhances readability in low-light conditions, allowing for accurate readings anytime and anywhere. Digital Display: The digital display feature offers clear and immediate feedback on measurements, ensuring and ease of use when monitoring oxygen levels with your DO9100 meter. Certified Quality: With CE certification, this replacement set meets high standards of quality and safety, ensuring reliability and performance for your dissolved oxygen measurements. Description/Features: Enhance the performance of your DO9100 Dissolved Oxygen Meter with our premium Oxygen Permeable Membrane Replacement Set. This essential accessory pack includes 5 high-quality membranes designed specifically for the DO9100 model, ensuring accurate and reliable oxygen measurement. Ideal for professionals in environmental monitoring, aquaculture, and water treatment industries. Please note, the main device is not included in this set. Specifications: Quantity: 5 pieces Compatibility: Specifically designed for the DO9100 Dissolved Oxygen Meter Function: Replacement of oxygen permeable membranes to precise oxygen level readings Included: 5 oxygen permeable membranes (device not included) Color: Black Material: Composite Package Contents: 5 pieces Replacement Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.