HM Digital C342 TDS and EC Calibration Solution， 342 ppm (NaCl)， 90 ml Volume<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>NaCl calibration solution， available in 342 ppm or 1000 ppm</li><li>Comes in lightweight HDPE plastic bottles</li><li>Sealed with a coated foam liner</li><li>Use the HM Digital TDS Calibration Solution (342 PPM) to periodically re-calibrate your HM Digital TDS meter or HM Digital Water Quality Tester</li><li>This HM Digital TDS Calibration Solution is also known as Water Tester Solution andTDS Meter Calibration Solution</li><li>The C-342 is NaCl solution (342 PPM)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Q43Q12WvL.jpg" noproxy>