"Steamed Lab: Tube Rack & Tongs" is a wonderful addition to "Steamed Lab", offering more experiment options.
The Tube Rack figure holds 5 test tubes, each of them with a LiquidFill morph to vary the tube's liquid level. The Tube Rack itself has a FeetTransX dial (accessible from the Hip body part), to give you more sitting options.
The Tongs figure can open and close like real tongs would via the TongsOpen dial, and also has a a TipsBend morph. Both dials are accessible from the Hip body part.