1:Brand Name: Neutral 2:Certificate: CE 3:TDS range: 0-1999ppm /mg / L Product description:1.Measuring range: ... ,Aquatic cultivation,Boiler water,Households and offices,Aquarium water,Teaching of physics and chemistry,Electroplating water,Cooling towers,Laboratories,Ionized water ... and water quality testing etc. Wholesale Water Quality TDS Meter KL-139