and frequent users who need reliable pH meter calibration at the acidic endpoint

5 × M10010B — pH 10

Foam-Lined Sealed Cap — Prevents evaporation and contamination between uses

stainless steel spigot available separately

Hanna HI98319 Marine Salinity Tester - Waterproof ppt/PSU/S.G. for Aquariums & Seawater ice machine hard water filter and frequent users who needDesigned to bring simplicity to salinity testing, the HI98319 Marine Salinity Tester measures conductivity (EC) to determine the salinity of natural and artificial seawater. Within seconds, the salinity and temperature are digitally displayed on the LCD. Displays results in parts per thousand (ppt), Practical Salinity Units (PSU), or specific gravity (S. G.). Comes with all the necessary solutions and batteries everything you need to get started