APIAPI Hydrometers

API Hydrometer: API ASTM Plain Form, 39/51, 0.1, Glass

The API Hydrometer is an API ASTM Plain Form instrument with a range of 39/51 and scale divisions of 0.1. This glass hydrometer has an overall height of 13 inches and is identified by manufacturer part number GW005H.

SKU 3G-OTH-368887

Brand

API

Item

Hydrometer: API ASTM Plain Form, 39/51, 0.1, Glass

Local availability & support

Delivery: Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment: Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

API

Manufacturer Part Number

GW005H 

Range

39/51 

Scale Type

API ASTM Plain Form 

Scale Divisions

0.1

Technical Documents

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API Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is an API hydrometer used for?

An API hydrometer measures the specific gravity of petroleum products and crude oils according to the American Petroleum Institute (API) scale. This plain-form glass instrument is used in refineries, laboratories, and quality-control settings to determine API gravity, which correlates to crude oil density and quality.

What are the specifications of the API ASTM Plain Form hydrometer?

This API hydrometer has a range of 39/51 API degrees, scale divisions of 0.1, and an overall height of 13 inches. It is made of glass and follows the ASTM Plain Form design. The manufacturer part number is GW005H. It is suitable for precise gravity readings in petroleum testing.

Where to buy API hydrometers worldwide?

3G Electric supplies API hydrometers worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us to order the API ASTM Plain Form hydrometer (MPN GW005H) for reliable sourcing and international shipping.

How to select the right API hydrometer for petroleum testing?

Select an API hydrometer based on the expected gravity range of your petroleum sample. For crude oils with API gravity between 39 and 51, the API ASTM Plain Form hydrometer with 0.1 scale divisions is appropriate. Ensure the glass instrument is clean and used at the calibrated temperature for accurate readings.

Used in

Common applications for API

Petroleum refining — API ASTM Plain Form hydrometers (e.g., range 19/31) for measuring crude oil gravity during distillation

Fuel blending — API Combined Form hydrometers (e.g., range 39/51) with thermometer for real-time density checks in gasoline blending

Marine fuel handling — API hydrometers (e.g., range 40/80) for verifying bunker fuel API gravity at storage terminals

Quality control labs — API ASTM Plain Form hydrometers (e.g., range 49/61) for routine testing of light distillates

Field testing — API Combined Form hydrometers (e.g., range 29/41) for portable density measurement in pipeline sampling

Petrochemical production — API hydrometers (e.g., range 15/21) for monitoring solvent density in chemical processing

API Products

3G Electric supplies API api hydrometers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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