Great question! A “glass tube” is a general term for hollow glass cylinders used in many projects. A “test tube” is a specific lab-style vessel designed for experiments and sample handling.

• Shape: Test tubes typically have a rounded bottom and open top; some models have flat bases.
• Standard sizing: You’ll often see sizes like 12x75 mm or 13x100 mm to fit common racks.
• Accessories: Many test tubes pair with caps or cork stoppers.
• Use case: Test tubes are ideal for classroom demonstrations, mixing small amounts, or gentle heating when the material supports it.

On Walmart, you’ll find both lab test tubes and specialty demonstration pieces.

Prices can vary, and you’ll see different options across the page. Instead of a single number, consider what affects the price:

• Material: Glass suitable for demonstrations vs. plastic for general handling.
• Size: Common dimensions like 12x75 mm and 13x100 mm may be priced differently.
• Pack quantity: Singles, classroom packs, or bulk cases.
• Closures: Tubes that include caps or corks can impact cost.
• Specialty designs: Extra-long demonstration tubes or equilibrium tubes.

Browsing current listings and using filters (material, size, pack count) can help you find options that fit your budget and needs. Availability for pickup or delivery may also vary by location.

They’re popular for classroom and hobby labs because they’re easy to handle and observe. Common uses include:

• Mixing small samples: Perfect for simple demonstrations or experiments.
• Gentle heating: When the product material supports it, under supervision.
• Holding and transporting samples: Short-term storage of liquids or solids.
• Demonstration displays: Clear walls make observation straightforward.

For safety, use a proper rack, avoid sudden temperature changes, and review the product details for material and temperature guidance. If you need secure storage, consider tubes that come with caps or cork stoppers. Results can vary based on setup and the materials you’re using.

Many lab-style glass test tubes are made from borosilicate glass, which is known for its clarity and resistance to thermal shock compared to general-purpose glass. That can make it a practical choice for demonstrations and gentle heating, depending on the specific product.

• Check materials: Product pages list whether a tube is borosilicate.
• Alternatives: Some tubes are plastic (e.g., polystyrene) for general handling, storage, or centrifugation tasks.
• Use case match: If heat is involved, look for borosilicate; if you just need storage or handling, plastic may be sufficient.

Always review the item’s description for temperature and usage guidance.

Choose size based on capacity, rack fit, and how you’ll use it:

• 12x75 mm: Compact tubes for smaller volumes and tight rack spacing.
• 13x100 mm: Longer tubes for slightly more capacity and visibility.
• Rack compatibility: Measure your rack’s hole diameter to match the tube’s outer diameter.
• Closures: If you need caps or corks, confirm the size/fit in the product details.
• Quantity: Classroom or group activities may benefit from multipacks.

Using Walmart’s size and material filters can help you narrow options quickly. Selecting the right size can improve handling and make demonstrations more consistent.