1、拨下下盖，按下ON／OFF开关此时液晶显示屏上显示000 PPM.

　　2、将需测试的水放入杯中（或将测试水放入下盖中），用大姆指和食指握住 TDS测试笔上部写有TDS字样处，将下端放入水中， TDS测试笔的液晶显示屏即可显示出被测水的TDS值。当测水笔向上提，离开被测水后，TDS即消失而恢复为000PPM.如果你想在取出 TDS测试笔时观看TDS值，请在 TDS测试笔未提出被测水时按下锁定按钮HOLD，观察TDS值后再次按下锁定按钮HOLD，则显示屏又恢复为000PPM。

　　3、测试结束后，按下 TDS测试笔的开关按钮，显示屏的数字消失。甩干水，盖上下盖以备下次使用（最好将 TDS测试笔的探讨用纯水或蒸馏水清洗一下探头，然后用吸水纸把 TDS测试笔探头上的水吸干，防止水垢覆盖TDS测水探头影响测试精度）。

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