YeBetter Hofun water hardness test meter for hydroponics ec meter with Big Backlit LCD is far superior than other ones, which allows wider angles of data reading and night reading.Besides, Red backlight ( ppm figure over 40 ) means high level ppm figure.Green backlight ( ppm figure below 40 ) indicates TDS figure qualified for direct drinking water (Notes:International standard adopted TDS figure 40 as a dividing line).[ EASY OPERATION & ENERGY SAVING ]meter allows one button operation.Just turn TDS meter on and stir water gently, then stabilized readings will be auto-locked on LCD in seconds, and the tds ppm meter will shut off automatically if without operation over 2 minutes.colour:Yellow + blackMaterial:ABSSize:16*1.5*3cmPackage Contents:1* Water Test Meter(With a leather storage bag)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.
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