Isopure Water · Testing & Treatment
Shop Testing & Treatment
Browse testing & treatment by category — jump straight to the group you need. Not sure which fits? Our team and the Filter Finder will match you fast.
Isopure Water · Meters & Monitors
TDS Meters, Water-Quality Monitors & Calibration Solutions
You can't manage water quality you don't measure. We carry handheld and inline meters for TDS, conductivity, pH, ORP and free chlorine — from Myron L, HM Digital and Sennotech — plus the calibration solutions and probes that keep them accurate.
How to choose a meter
Handheld vs. inline. Handheld meters (TDS-3, Ultrameter) are for spot checks and service; inline dual monitors show RO performance before/after in real time.
One parameter or many? A simple TDS pen verifies RO output; a multi-parameter meter (pH/ORP/conductivity/chlorine) suits pros and treatment plants.
Calibrate regularly. Meters drift — keep the matching calibration standard (342/442 ppm, pH buffers) on hand.
Replace the probe. pH/ORP probes wear out; a fresh probe restores a meter that won't hold calibration.
Tell us what you need to measure and we'll match the meter and standards. Ask us.
