Check the listing for details. Colloidal Silver Test Meter PPM. Color: Silver, Condition: New. Listed at 34.99 USD. RELIABILITY - Reliably Test Colloidal Silver PPM. Know if your Colloidal Silver Generator is Working Properly and Making a Good Quality Colloidal Silver Solution. SPECIALLY CALIBRATED FOR COLLOIDAL SILVER - This Test Meter is Specially Calibrated to Test Colloidal Silver PPM (parts per million). Other Test Meters Give Very Broad and Inaccurate Readings Since They Aren't Calibrated For Colloidal Silver. EASY TO USE - Comes with Simple Informative Instructions! A MUST HAVE - Test To Know That Your Colloidal Silver Generator Has Worked Properly. No Colloidal Silver Generator Should be Without it.100% SATISFACTION GUARANTEED or Your Money Back! If You Are Not Completely Satisfied Then We Will Immediately Refund Your Purchase Price!Free Shipping!