Brand: KT - Model: KT-401 - Quantity: 1 - Color: White - Material: ABS - Screen size: 1.3 inch LCD - Features: Environmental negative ion tester - Measurement range: 1~1999 ten thousands anion per cubic centimeter - Resolution: 1 ten thousands anion per cubic centimeter - Small volume and portable - Display concentration of positive and negative air ion - Suitable for all kinds of ion generators - Display value is thousand maximum to 1999 - Powered by 2 x LR44 batteries - Usage: - Turn on the power - Thumb to keep in contact with the front of the square metal piece the back of the metal plate toward the air negative ion generator to be tested distance nearer the tester reading higher whereas the smaller. Therefore to ensure the accuracy of the measurements please keep an appropriate distance from the measuring instrument and the negative ion generator to be tested. - In measurement process please not hand a piece of metal come into contact with the rear of the instrument otherwise it would be inaccurate readings. - Measurement without symbol indicates positive ions; It's negative ions if display "-". - For re-measurement should firstly turn off the power. Then restart. - The measurement method of textiles: Use thumb to contact the front metal plate; and the back of the metal plate gently rubbing toward textiles to be tested the monitor will display concentration of the ion polarity which can be used as a kind of important reference about the ionic capacity of the fabric produced. - Packing list: - 1 x Tester - 1 x English user manual - 4 x Batteries