VEE GEE Scientific High-Range Specific Gravity Hydrometer SG 2.0-4.0, 305mm

Standard laboratory hydrometers top out at SG 2.0 — inadequate for heavy acid, mineral salt, and dense industrial liquid applications where specific gravity regularly exceeds 2.0. The VEE GEE Scientific 6603 High-Range Specific Gravity Hydrometers extend coverage from SG 2.000 to 4.000, spanning the measurement zones encountered in heavy chemical manufacturing, mineral processing, and high-density industrial fluid analysis.

Available in four models: two wide-range instruments (6603-8: 2.0–3.0; 6603-9: 3.0–4.0) with 0.010 subdivisions for general monitoring, and two fine-resolution instruments (6603-21: 2.2–2.42; 6603-22: 2.4–2.62) with 0.002 subdivisions for applications requiring tighter measurement control within narrower ranges. All four are 305 mm (12 in) length and autoclavable glass — compatible with standard laboratory hydrometer cylinders.

Features and Benefits

• Wide Range Coverage (2.0–4.0 SG): Four models span from SG 2.000 through 4.000 — covering the high-density fluids encountered in heavy chemical, acid manufacturing, and specialized industrial processing applications beyond the range of standard hydrometers.

• 0.002 and 0.010 Subdivisions: 6603-21 and 6603-22 offer 0.002 subdivisions for tighter resolution in the 2.2–2.6 range. 6603-8 and 6603-9 use 0.010 subdivisions across wider ranges (2.0–3.0 and 3.0–4.0 SG) where concentration changes are large.

• 305 mm Length: Standard 12-inch hydrometer format compatible with most laboratory hydrometer cylinders.

• Calibrated at 15°C/60°F: Dual temperature reference (15°C and 60°F) — compatible with both metric and US standard measurement conventions.

• Autoclavable: Glass and borosilicate construction is autoclave-compatible for sterilization in laboratory use.

• 1-Year Warranty: Standard VEE GEE Scientific instrument warranty.

Specifications by Model

Laboratory Applications

• Sulfuric acid and nitric acid concentration monitoring in chemical manufacturing where SG exceeds the 1.840 upper limit of standard hydrometers

• Mineral processing slurry density measurement in mining operations — gold, copper, nickel leach circuits where pulp densities reach SG 2.0 and above

• Heavy salt solution monitoring in industrial brine and mineral salt processing

• High-density drilling mud measurement in oil and gas exploration operations

Frequently Asked Questions

What is the largest SG these hydrometers can measure?
6603-9 covers SG 3.000–4.000 — the highest range in the VEE GEE standard catalog. For liquids exceeding SG 4.0, custom or specialized instruments are required. Most laboratory heavy chemicals (concentrated sulfuric acid at SG 1.84, bromine at SG 3.1) fall within the 6603 series coverage.

Why do some models have 0.002 subdivisions and others 0.010?
The 6603-21 and 6603-22 cover narrow 0.22-unit ranges (2.2–2.42 and 2.4–2.62), so 0.002 subdivisions fit the available scale length with readable spacing. The 6603-8 and 6603-9 cover 1.0-unit ranges — at 0.002 subdivisions, that would be 500 graduation marks in the same length, unreadable in practice. The 0.010 subdivision is the appropriate resolution for wide-range instruments.

Are these compatible with standard hydrometer cylinders?
Yes — 305 mm length is the standard format compatible with most laboratory glass or plastic hydrometer cylinders. Confirm your cylinder is long enough and wide enough for the instrument bulb diameter.

Quality Assurance

VEE GEE Scientific 6603 hydrometers are manufactured from borosilicate glass with permanently graduated scales calibrated against reference standards at 15°C/60°F. Autoclavable glass construction. Backed by a 1-year warranty.

Academic and Institutional Pricing

LabSupplies.com offers tiered quantity pricing for academic and research institutions. As an authorized dealer, we ship directly from USA inventory.