Hãng sản xuất: HANNA - ÝRange 0.0 to 20.0 mg/LResolution 0.1 mg/LAccuracy ±0.2 mg/L ±3% of reading @ 25°CLight Source Tungsten lampLight Detection silicon photocell with narrow band interference filter @ 525 nmBattery Type / Life 1 x 9V / approx. 40 ...