Calibration Standard HI 721 Checker HC ®

Range 0:00 to 7:00 g / L | Photometric Method | Resolution 0.01g / L

Range 0 - 500 PCU | Platinum Cobalt method | Resolution 5 PCU

Range 0.00 - 9.99 ppm NH3-N | Nessler Method | 0.01ppm resolution

Range 0:00 to 5:00 ppm | EPA Method 315 B | 0.01ppm resolution