Download the Free 2025 3D Investigation Sampler

Get inspired with three brand-new investigations that support three-dimensional learning in biology, chemistry, and physics. Each one is designed to spark curiosity with real-world phenomena, hands-on data collection, and meaningful student sensemaking.

Whether you use them now or later in the year, these free experiments are easy to implement and cover core science concepts.

In these investigations, students explore:

• Biology: What can a sealed biosphere reveal about life on Earth—and beyond? Explore gas exchange in photosynthesis and cellular respiration.
• Chemistry: Why does tea change color when lemon juice is added? Investigate pH, chemical equilibrium, and Le Châtelier’s principle.
• Physics: What forces are at play when an elevator goes up? Model mass, motion, and Newton’s second law with an Atwood’s machine.

Featured Products

Go Direct CO₂ Gas Sensor

The Go Direct^® CO₂ Gas Sensor measures gaseous carbon dioxide concentration levels, air temperature, and relative humidity. This versatile sensor can be used in a wide range of biology experiments, from exploring photosynthesis and respiration to investigating yeast fermentation. 

GDX-CO2

$229

Go Direct O₂ Gas Sensor

Monitor oxygen gas levels alongside CO₂ to deepen student understanding of respiration and photosynthesis in biological systems. Ideal for a range of biology and physiology experiments, remote testing catalase activity to oxygen consumption during exercise, this sensor supports robust, real-time data collection.

GDX-O2

$219

Go Direct pH Sensor

The Go Direct pH Sensor is an important and versatile sensor for lab and field activities alike. It gives students the freedom to explore pH without the inconvenience of wires as they conduct acid-base titrations, monitor pH change during chemical reactions, test the alkalinity of bodies of water, or investigate household acids and bases.

GDX-PH

$109

Go Direct SpectroVis  Plus Spectrophotometer

The Go Direct SpectroVis^® Plus Spectrophotometer gives students a hands-on introduction to spectroscopy with fast, wireless data collection. Use it in a range of applications—from chemistry and biology to environmental and physical science. Students can explore absorbance, percent transmittance, fluorescence, or intensity as they investigate reaction rates or determine concentration using Beer’s law.

GDX-SVISPL

$479

Go Direct Photogate

The Go Direct Photogate is a double-gate sensor that students can use to easily and accurately measure velocity and acceleration. Ideal for investigating the motion of an object in free fall, rolling objects, collisions, and pendulums, without needing to know anything about the geometry of the object.

GDX-VPG

$105