clear Colour-change Indicator For Wateringeasy To Pop In The Soilgreat For Houseplant Growers Starting Outprevents Under & Overwateringmake Growing Houseplants Easy With This Reliable Watering Indicator That Turns From Blue To Red As Your Houseplants Need Water. A Clear Window On The Indicator Displays A Red Or Blue Screen; Water Your Plants When It Shows Red & Leave Your Plant Be When The Window Is Blue.this Clever Piece Of Kit Is Ideal For Those With Green Fingers That Want To Branch Into Indoor Gardening. Cacti, Forest Plants & Indoor Ferns Can Be Grown To The Best Showing Off Beautiful Leaves & Bright Flowers When The Soil Has The Perfect Moisture Level. With The Houseplant Watering Indicator A Perfect Soil Moisture Level Is An Instant Possibility.useful Tip:we Recommend That You Wipe Your Indicator Clean Daily For The Most Reliable Colour-readings. Feed Your Houseplants When They Are In Active Growth Or In Flower With Westland Houseplant Feed Concentrate.