It seems there may be some confusion in the description of the "oil ruler" you've provided. Typically, when referring to a tool used for measuring oil levels, the term "oil dipstick" is more commonly used. However, based on your description, I'll assume you're referring to a tool or device specifically designed for measuring oil products, possibly in a broader sense that includes not just engine oil but also petroleum products in tanks.
Here's a clarification and adjustment to your description:
Oil Ruler (or Oil Level Measurement Tool)
The oil ruler (or oil level measurement tool) is a device used to measure the height of petroleum products in an oil tank. To improve the accuracy of readings, a small amount of water test cream (or a similar contrasting agent) can be applied to the section of the ruler that is inserted into the oil, making the oil-water interface more visible and allowing for more precise measurement of the oil level.
Material and Measurement Ranges:
Aluminum Alloy Version: Designed with aluminum alloy for durability and corrosion resistance, this version has a metering range of 0-200cm, making it suitable for larger tanks or applications requiring longer measurement distances.
Carbon Steel Version: Constructed from carbon steel, this version is intended for shorter measurement ranges, typically up to 0-27cm. It may be more suitable for smaller tanks or applications where the oil level does not vary significantly.
Bonor Version: This version, labeled as "Bonor," has a metering range of 0-50cm, falling between the aluminum alloy and carbon steel versions in terms of measurement capabilities. The specific brand or model name "Bonor" suggests it could be a specialized or branded product with its own unique features or design considerations.
Note:
The application of water test cream or any other contrasting agent should be done carefully and in accordance with safety guidelines, as some chemicals may react with the oil or tank materials.
Always refer to the manufacturer's instructions for proper use and maintenance of the oil ruler or oil level measurement tool.
The measurement ranges provided are indicative and may vary depending on the specific model or version of the oil ruler.