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Click the right button to check the scales and feasible calculations of the CONCISE Circular Slide Rules. 
CONCISE Online Shop > Slide Rules > Circular Slide Rule I (introduction) > Circular Slide Rule II (specifications)
Placing an Order
The CONCISE Online Shop also carries the following slide rules. - Card-type Calculating Scale
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- Size: 84mm (3-5/16") in diameter
- Scale: D · C, CI, A, K on the front
- The most popular circular slide rule for standard Japanese use.
- Makes general calculations such as multiplication, division, proportion, square root and cube root.
- The back side includes various kinds of conversion tables for area, cubic volume, weight, temperature, pressure, velocity, etc.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 27N 84mm or 3-5/16" in diameter 16g or 9/16 oz. ¥1,000 
- Size: 84mm (3-5/16") in diameter
- Scale: D · C, CI, A, K on the front
- The most popular circular slide rule for standard English use.
- Makes general calculations such as multiplication, division, proportion, square root and cube root.
- The back side includes various kinds of conversion tables for area, cubic volume, weight, temperature, pressure, velocity, etc.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 28N 84mm or 3-5/16" in diameter 16g or 9/16 oz. ¥1,000
- Size: 100mm (3-15/16") in diameter
- Scale: A, D · C, CI, B, K, L on the front / DI, D · S, T1, T2, ST on the back
- Makes various calculations ranging from general multiplication and division to the square root, cube root and trigonometric function.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 270N 100mm or 3-15/16" in diameter 40g or 1-7/16 oz. ¥2,200
- Size: 110mm (4-5/16") in diameter
- Scale: K, A, D · C, CI, B, L on the front / LL3, LL2, D · C, S, T1, T2, ST on the back
- Especially designed for professionals, this circular slide rule enables you to make various calculations ranging from general multiplication and division to the square root, cube root, trigonometric function and even logarithm and descending series.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 300 110mm or 4-5/16" in diameter 45g or 1-9/16 oz. ¥2,600
Circular Slide Rule for Metal Weight Calculation
Note: This product is available with Japanese indices and instructions ONLY.
- Size: 106mm (4-3/16") in diameter
- Scale: exclusive
- Calculates the weight of metal you would like to know.
- Precisely converts the specific gravity of the metal into its weight according to its shape such as a plate, pipe, pole, etc.
- The back side includes various kinds of weight tables for standard steel based on JIS (Japanese Industrial Standard) standard.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)Metal Weight Calculation 106mm or 4-3/16" in diameter 33g or 1-3/16 oz. ¥2,400
Circular Slide Rule No. 480 Professional
Note: This product is available with Japanese indices and instructions ONLY.
- Size: 105mm (4-1/8") in diameter
- Scale: D · C, CI, P1, P2 on the back
- Makes calculations concerning the number of days. It helps you organize each time frame out of the total schedule and also serves as a chart of the days elapsed.
- The back side allows you to make general calculations such as multiplication, division, proportion and profit ratio.
- Very popular among public health centers and livestock farmers.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 480 105mm or 4-1/8" in diameter 40g or 1-7/16 oz. ¥2,500
Circular Slide Rule for Stadia Professional
Note: This product is available with Japanese indices and instructions ONLY.
, COS2 on the front / D · C, S, T, ST, L on the back
- Size: 96mm (3-3/4") in diameter
- Scale: D · SIN COS
Helps you with stadia surveying. Equipped with a ruler for SIN, COS and COS2, this circular slide rule calculates the difference in height and horizontal distance very accurately. The back side allows you to make calculations such as general multiplication and division, trigonometric function and percentile inclination.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)Stadia 96mm or 3-3/4" in diameter 38g or 1-5/16 oz. ¥2,400
Circular Slide Rule for Manufacturing Time Calculation
- Size: 120mm (4-3/4") in diameter
- Scale: exclusive
- Helps you calculate primarily estimated manufacturing time when using a machine tool.
- Can be applied to machinery such as a lathe and a milling machine.
- The back side indicates the cutting speeds for soft metal and casting metal.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)Manufacturing
Time Calculation120mm or 4-3/4" in diameter 40g or 1-7/16 oz. ¥3,000
Circular Slide Rule No. 73 (World's Local Time Calculating Scale)
Note: This product is available with Japanese indices and instructions ONLY.
- Size: 77mm (3-1/16") in diameter
- Scale: exclusive
- Allows you to check the world's local time and difference in time at a glance.
- Can be applied to 40 cities of the world.
- The back side describes how to use this slide rule.
- Recommended as a novelty item with your company name and logotype imprinted.
Model Dimensions
(mm / in.)Weight
(g / oz.)Our Price
(Japanese yen)No. 73 77mm or 3-1/16" in diameter 17g or 5/8 oz. ¥400
