... frequency: 50 and 200 KHz2) 5.6-inch TFT LCD display with 8-color or multi-level amber ... ) Compound Temperature sensor optionSPECIFICATIONS1. General(1) Display5.6inch TFT LCD(2) Echo Color8 colors (including background color) ... The background color is selectable from blue, light blue, white and black.(3) Basic RangeMeters: 5/10/20/40 ... 5, 10, 20, 40, 80, 150, 300Pulse-Length(ms) 0.2, 0.2, 0.2, 0.4, 0 ...