the gel-filled reference never needs refilling

Alarm: Optional setting

Filter Replacement: When you notice a drastic change in water flow rate

5°C / ±1°F Probe HI73311 replaceable EC/TDS graphite electrode (included) Automatic Shut-Off After 8 minutes of non-use Power Supply Four 1

Milwaukee MI414 PRO Photometer is for users demanding fast

Milwaukee MI555-005 Free SO2 Acid Reagent | MI455 Titrator 2x210mL photometer accessories the gel-filled reference never needsDescription MI555 05 acid reagent is needed to determine free sulfur dioxide using the MI455 Mini Titrator. The acid reagent lowers the pH value of the sample prior to performing a titration. Design Features Pre measured solution Sealed against light and air Includes expiry date and lot number Specifications Description: Free SO2 Acid Reagent Package: Bottle Size: 210 mL Quantity: 2