Are either of these instruments recommended for monitoring iron levels vs using a visual comparison wheel like the Hach IR-18? Has anyone had experience with either one to validate or invalidate their accuracy claims?
www.us.milwaukeeinstruments.com
Both the Hanna HI721 and Milwaukee MW14 provide iron levels at a resolution of 0.01 PPM and claim to be accurate to +/- 0.04 ppm +/- 2% of reading on scale from 0 to 5 ppm.
Iron Colorimeter – Checker® HC HI721
The HI721 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iron.
www.hannainst.com
MW14 Iron Handy Photometer
Iron handy photometer with range 0.00 to 5.00 mg/L
Both the Hanna HI721 and Milwaukee MW14 provide iron levels at a resolution of 0.01 PPM and claim to be accurate to +/- 0.04 ppm +/- 2% of reading on scale from 0 to 5 ppm.