lot number and expiration date

The MA991B/1's gel-filled reference eliminates electrolyte refilling

Most tap water has a pH between 6

Total supply: 18 months (based on 6-month filter lifespan)

Hanna BL983317-1 Conductivity Mini Controller - 0-10 mS/cm Low Range EC Relay water conditioning lot number and expiration dateProfessional Conductivity Mini Controller with Low Range Relay for Automated EC Monitoring The Hanna BL983317 1 is a compact, professional grade conductivity mini controller designed for automated EC (electrical conductivity) monitoring and control from 0. 00 to 10. 00 mS cm. Featuring a low range relay output, this controller continuously monitors conductivity levels and automatically activates connected equipment to maintain optimal water chemistry