Waterproof ECTestr 11 PlusUse this tester for either cup style or dip style measurements. For cup style, pour a small amount of your sample directly into the sensor cup until it overflows; for dip style, simply immerse tester tip into sample. Replaceable sensor lets you reuse meter body many times over. Valox housing and stainless steel electrodes for good chemical compatibility. Automatically or manually select measuring range Waterproof, dustproof housings Push button