Coupon code applied successfully.

Sale!

Set of laboratory glass droppers with ground joints

500mm laboratory dropper with #24 ground joint

Glass pipette with internal liquid flow indicator

Close-up view of laboratory glass ground joint

400mm laboratory dropper with #24 ground joint

300mm laboratory dropper with #24 ground joint

250mm laboratory dropper with #24 ground joint

200mm laboratory dropper with #24 ground joint

150mm laboratory dropper with #24 ground joint

100mm laboratory dropper with #24 ground joint

40mm laboratory dropper with #24 ground joint

Features & Details

🛡️ CLOSED BOTTOM TUBE	Hermetically sealed bottom protects metal RTD/PT100 probes and glass thermometers from corrosive reaction vapors.
🔬 #24 STANDARD JOINT	Standard 24/40 or 24/29 ground-glass taper joint fits securely into multi-neck distillation flasks and chemical reactor lids.
📏 40MM TO 500MM LENGTH	Immersion depth options from 40mm up to 500mm ensure the temperature probe reaches deep into liquid cores without dead zones.
🧪 BOROSILICATE 3.3	Heavy-walled 3.3 borosilicate glass withstands severe thermal shocks, rapid quenchings, and continuous boiling acids.

About this item

Product specification

Design Specifications

Xin Tester GTS Series Details

Material & Construction

Glass Material

USP Type 1 Borosilicate 3.3 Glass

Joint Standard

#24 (24/29) Precision Ground Taper Joint

Bottom Architecture

Closed Bottom (Fully Sealed to prevent liquid ingress)

Available Insertion Lengths (Model SKUs)

GTS-40mm-#24 (40mm Length)

GTS-100mm-#24 (100mm Length)

GTS-150mm-#24 (150mm Length)

GTS-200mm-#24 (200mm Length)

GTS-250mm-#24 (250mm Length)

GTS-300mm-#24 (300mm Length)

GTS-400mm-#24 (400mm Length)

GTS-500mm-#24 (500mm Length)

✦ Zero Leakage: Frosted using 300-mesh green silicon carbide for perfect airtight seals.
✦ Ultimate Durability: Offers extremely high chemical stability against boiling acids and organic solvents.

Reaction Vessel Thermal Sensing Accessories

Xin Tester Glass Thermometer Sleeve (#24 Ground Joint)

Directly exposing stainless steel thermocouple sheaths to boiling acids or aggressive reflux vapors ruins expensive sensors rapidly. The Xin Tester closed-bottom glass thermowell adapter isolates the sensor completely inside an inert 3.3 borosilicate glass sheath. Filled with a heat-transfer oil or dry-mounted, it provides accurate thermal response without sample cross-contamination. Explore our complete selections in the Lab Glassware catalog.

Precision Ground Taper

The #24 frosted taper joint features fine-ground micro-finishing to ensure reliable vacuum sealing and prevent reflux vapor leakage during fractional distillation procedures.

Uniform Wall Heat Transfer

Controlled thin-wall bottom geometry minimizes thermal lag, ensuring rapid temperature tracking by internal sensors while retaining mechanical resistance against magnetic stirrer collisions.

Sleeve Length Selection Notice

Measure the depth from your flask joint to the desired immersion point before ordering. Available in 40mm up to 500mm lengths.

Related testing & equipment:
Lab Stirring & Heating |
Lab Water Bath & Oil Bath

Related products:
PTFE stirrer guide sleeve

Use Cases

Acid & Corrosion Resistant Chemical Synthesis School Science Labs

FAQs

What is the main purpose of the "Closed Bottom" design?

The closed bottom acts as a protective barrier between the thermometer and your sample liquid. Specifically, it replaces traditional rubber stoppers which can corrode or leak. Consequently, your thermometer stays clean and reusable, while your reaction remains pure and uncontaminated by external materials.

Can this glass sleeve handle rapid heating without cracking?

Yes, absolutely. Xin Tester uses premium borosilicate 3.3 glass with a very low expansion coefficient. This material is specifically engineered to handle extreme thermal shock. Therefore, you can move your setup from high-heat synthesis to ambient cooling without compromising the integrity of the glass.

How do I choose the correct length for my reaction flask?

You should measure the vertical distance from the #24 joint to the center of your liquid medium. Specifically, we recommend selecting an insertion length (40mm-500mm) that allows the closed bulb of the sleeve to be fully submerged in the sample. This ensures the thermometer senses the actual internal liquid temperature accurately.

Is this sleeve resistant to highly corrosive acids like HCl or H2SO4?

Yes. High borosilicate glass is chemically inert to almost all strong acids and alkalis. Consequently, it is the safest choice for aggressive chemical research. For maintenance, we recommend cleaning the ground joint with a non-abrasive solvent after use to prevent “freezing” between the glass components.

Xin Tester Glass Thermometer Sleeve (#24 Joint), Closed Bottom 40-500mm Borosilicate 3.3 Adapter

Price range: $8.70 through $20.51

Extra 5% Off with code: welcome5

SIZE

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.