Apera LabSen®221 Combination pH Electrode for Viscous and Low Ion Concentration Samples pH TestingSKU: AI3102 Click on image to view full size. Backed by proprietary Swiss sensor technology and materials, the LabSen 221 Routine Combination pH Electrode is designed for viscous and low ion concentration samples’ pH testing, and ideal for titration. The electrode is compatible with TRIS buffer solutions. Moveable Sleeve Junction – The LabSen 221 pH electrode is easy to clean, especially suitable for low ion concentration solution and non-aqueous solution. The infiltration rate of the electrolyte is determined by the tightness of the sleeve during installation. Long-Life Reference System – The LabSen 221 pH electrode adopts a long-life reference system, which is composed of a glass tube, AgCl, and a reference silver wire. The top end of the slim glass tube is stuffed with cotton, which prevents the reaction between AgCl and electrolyte when the temperature changes. It improves the stability of reference electrode and extends the service life of the electrode. Special Glass Membrane – The LabSen 221 pH electrode adopts a Cylindrical glass membrane, which is highly resistant to general impact (the traditional glass bulb membrane is a lot more fragile), and can be tested in high-temperature samples (up to 176°F). SPEC: Material: Lead-free glassTemp. Sensor: NoJunction: Moveable SleeveReference: Long-LifeElectrolyte: 3M KCLLength: 130mmDiameter: 12mmMembrane Shape: CylindricalRange: 0-14 pHTemp. Range: -5 to 80°C (23 to 176°F)Connector: BNCCable: 3 Ft SPECS: ===============–> About Us PaymentShippingReturns We are involved in the water and wastewater business since 2009 and served several customers since then. Our water testing kits are the best available products in this price range which was verified in several product tests. All of our products ship directly from our different warehouses across the United States so you get your items quickly and in perfect condition. Every product comes with a manufacturer warranty and our standard return policy. Our products are a 100% authentic and brand new. We consider it a top priority that our customers are happy and in the rare event that they are not, we do everything we can to fix the situation. We accept PayPal only. • Our stock all ships from our US-based warehouses.• Shipped via USPS or UPS (depending on location and package weight)• Unless stated otherwise, all orders will ship within 24 hours of your payment being processed. Check our feedback to see the great reviews of FAST shipping we offer.• Shipping within the US is always free• Shipping outside the US is possible (see below shipping rates) • We offer a 14 day return/exchange policy for our products.• You can choose refund or exchange if you are dissatisfied for any reason with your product.• When returning an item, it must be in all of the original packaging and include all of the original accessories or items that came with it. The item and package should be in original and perfect condition. • You will be required to cover shipping on the return of defective items.• All returns MUST be done within 30 days of date of purchase. Please note that we cannot give refunds or replacements after the 30 day limit has expired.• When sending in a return, please note that it can take up to 7 business days for the return to be processed. We do our best to process as quickly as possible.• Buyers outside the USA please note – ALL of our electrical appliances sold in our store are 110-120V.• Return policy for buyers outside the USA – We offer to return the items within 30 days. The BUYER will ship the item at his own cost. We are always doing our best and in case something goes wrong please give us the chance to fix it.

Apera LabSen®841 Professional Combination pH Electrode for Strong Base Solutions – BNC ConnectorSKU: AI3145 Click on image to view full size. Proprietary pH sensor technology and materials from Switzerland. Unique LabSen H glass membrane, which has a faster response rate, better repeatability in strong base solutions (10-14 pH). Silver Ion Trap Reference System – On top of the Long-Life reference system, a silver ion trap is added to prevent the junction being blocked by silver sulfide. Standard BNC Connector. 6-Month Warranty fulfilled by Apera Instruments. Backed by proprietary Swiss sensor technology and materials, the LabSen 841 Professional Combination pH Electrode/Probe is designed for pH measurements for strong base solutions (10-14 pH). Special Glass Membrane – The LabSen 841 pH Electrode/Probe adopts a special H glass membrane, which has better accuracy and repeatability in strong base solutions; the hemispherical sensor is also built tough and highly resistant to general impact (completely different from the traditional fragile glass bulb membrane). Silver Ion Trap Reference System – The LabSen 841 pH Electrode/Probe adopts a Silver Ion Trap reference system. On top of the Long-Life reference system, a silver ion trap is added to prevent the junction being blocked by silver sulfide. The electrode uses a BNC connector, compatible with any pH meters that use BNC connectors, such as Apera Instruments MP511, SX811, PH700, PH800, PC800, PH820 and PC820. The temperature sensor is not built-in. Users need to have a separate temperature probe (ex: Apera Instruments MP500) to enable ATC or manually input temperature to realize temperature compensation. SPECS: Material: Lead-free glassTemp. Sensor: NoJunction: CeramicReference: Silver Ion TrapElectrolyte: 3M KCLLength: 120mmDiameter: 12mmMembrane Shape: Half-BallRange: 2-14 pHTemp. Range: 0 to 100°C (32 to 212°F)Connector: BNCCable: 3 Ft SPECS: ===============–> About Us PaymentShippingReturns We are involved in the water and wastewater business since 2009 and served several customers since then. Our water testing kits are the best available products in this price range which was verified in several product tests. All of our products ship directly from our different warehouses across the United States so you get your items quickly and in perfect condition. Every product comes with a manufacturer warranty and our standard return policy. Our products are a 100% authentic and brand new. We consider it a top priority that our customers are happy and in the rare event that they are not, we do everything we can to fix the situation. We accept PayPal only. • Our stock all ships from our US-based warehouses.• Shipped via USPS or UPS (depending on location and package weight)• Unless stated otherwise, all orders will ship within 24 hours of your payment being processed. Check our feedback to see the great reviews of FAST shipping we offer.• Shipping within the US is always free• Shipping outside the US is possible (see below shipping rates) • We offer a 14 day return/exchange policy for our products.• You can choose refund or exchange if you are dissatisfied for any reason with your product.• When returning an item, it must be in all of the original packaging and include all of the original accessories or items that came with it. The item and package should be in original and perfect condition. • You will be required to cover shipping on the return of defective items.• All returns MUST be done within 30 days of date of purchase. Please note that we cannot give refunds or replacements after the 30 day limit has expired.• When sending in a return, please note that it can take up to 7 business days for the return to be processed. We do our best to process as quickly as possible.• Buyers outside the USA please note – ALL of our electrical appliances sold in our store are 110-120V.• Return policy for buyers outside the USA – We offer to return the items within 30 days. The BUYER will ship the item at his own cost. We are always doing our best and in case something goes wrong please give us the chance to fix it.