♜Suitable for 1.5inch chlorine tablet. ♜This dispenser works for in ground pools, massage bathtub, hot tubs, above ground pools, and spas. ♜Never worry about chlorine levels in your swimming pool or spa again. ♜Built-in thermometer reads temps in both ℉ and ℃. Lid twists and securely locks. ♜Made of premium abs material, which is sturdy and durable.