Features: 100%?Brand?new?and?high?quality This?item?can?be?used?in:?water?purifiers?and?filters，?food?(vegetable，?fruits)?&?drink?quality?monitoring，?pools?and?spas，?aquariums，?hydroponics Specifications: Hold?function:?Saves?measurements?for?convenient?reading?and?recording ?Auto-off?function:?Turns?off?meter?after?10?minutes?of?non-use?to?conserve?batteries Dual?Range:?Measures?form?0-999ppm，?with?a?resolution?of?1ppm.?From?1，000?to?9，990ppm，?the?resolution?is?10ppm，?indicated?by?drinking?x?10image，?Factory?calibrated Rang:?0-9990ppm Accuracy:?+/-2% Battery:?2?x?1.5V?Button?Cell?battery Item?size:156mm?x?30mm?x?20mm(6.1?x1.2?x0.9in) Net?weight:49g Weight:59g Package?Included: 1?x?TDS?Meter?Tester Note:?Do?not?drop?the?entire?TDS?meter?in?water?of?dip?beyond?the?maximum?immersion?level.?This?unit?is?not?water-tight?and?is?not?covered?under?the?warranty?if?water?enters?the?unit.It?will?display?only?three?digits.?When?the?measured?results?is?more?than?999ppm，?the?screen?display?will?be?"xxx?*10".?For?example，?“2000”?will?appear?as?“200*10”?in?the?screen. aeProduct.getSubject()