Colors between 250 and 500 ppm are not sufficient. You are making a guess. Still my favorite test strip because I regularly get HOCl readings over 250 and a comparable product only reads 200. I wish there were more gradations.
TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review
π― Honey Refractometer with Automatic Temperature Compensation (ATC) - Tiaoyeer Moisture, Brix, and Baume Refractometer for Honey, 58-90% Brix Scale Range - Honey Moisture Tester
31 Review
80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
10 Review
π PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review