à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì à¤ÃÕèͧÇÑ´ à¤Ã×èͧÇÑ´âÍÍÒÃì¾Õ à¤Ã×èͧÇÑ´âÍÍÒÃì¾Õ ORP Meter à¤Ã×èͧÇÑ´âÍÍÒÃì¾Õ à¤Ã×èͧÇÑ´âÍÍÒ¾Õ ORP ÇÑ´¤ÇÒÁµèÒ§ÈÑ¡´Ôì HI98201 is occurs most readily in water treatment as well as pool and spa maintenance where an oxidizer, such as chlorine, is added to the water to destroy contaminants. The higher the ORP value, the greater the sanitizing power of your water. HI 98201 ORP tester can provide a valuable indication of water quality. HI 98201 ORP is a unique hand-held tester developed for quick and affordable tests. This tester utilizes a platinum electrode and HANNA instruments' unique renewable cloth fiber junction, that can be pulled out when clogging occurs, reactivating the reference and restoring the electrode. Range ±999 mV Resolution 1 mV Accuracy ±5 mV Battery Type / Life 4 x 1.5V / approx. 700 hours of continuous use Environment 0 to 50°C (32 to 122°F); RH max 95% Dimensions 175 x 41 x 23 mm (6.9 x 1.6 x 0.9") Weight 95 g (3.4 oz.) Hanna HI98201 ORP Meter Oxidation Reduction Potential Water Quality Meter à¤Ã×èͧÇÑ´¤ÇÒÁµèÒ§ÈÑ¡Â à¤Ã×èͧÇÑ´¤Ø³ÀÒ¾¹éÓ à¤Ã×èͧÇÑ´¤èÒ ORP