Hydrometer Sea Test Chamber carded SKU: RSWH01 Category: Aquarium Accessories Related products Foam Base 12×15 (use 3 For 36″ Tank) (PKT 10) Foam Insert Aquaclear 200 /50 Aquafx 4ft Cabinet & Hood Black 48×18 Assembled (Pickup or local delivery only) Foam Insert Aquaclear 300 / 70