Length Comparator
Product Code : JA-M-8896
The Length Comparator (SKU JA-M-8896) measures small changes in the length of concrete and mortar bars during storage. It is used for the drying shrinkage of concrete, the autoclave expansion of Portland cement and the potential expansive reactivity of cement-aggregate combinations in mortar bars. The length comparator has a 0.002 mm dial gauge, a 6.5 mm reference ball and a stainless steel standardisation bar with an insulated grip. It is made by JaincoLab.
Specifications
The dial gauge reads to 0.002 mm over 5 mm, the reference ball is 6.5 mm in diameter, and a stainless steel standardisation bar with insulated grip is included; an electronic dial gauge is optional at extra cost.
| Product | Length Comparator |
| SKU | JA-M-8896 |
| Dial gauge | 0.002 mm x 5 mm |
| Reference ball diameter | 6.5 mm |
| Included | Stainless steel standardisation bar with insulated grip |
| Optional | Electronic dial gauge (extra cost) |
| Tests | Drying shrinkage, autoclave expansion, cement-aggregate reactivity |
Applications of the length comparator
Reading each bar against the standard bar before every measurement removes the effect of temperature on the frame, so small changes over weeks can be trusted.
- Drying shrinkage of concrete prisms
- Autoclave expansion of Portland cement bars
- Alkali-aggregate reactivity of mortar bars
- Use with 254 mm gauge-length bar moulds
Scope of supply and ordering
The listing covers one length comparator with dial gauge and standardisation bar, from JaincoLab. The electronic dial gauge is optional at extra cost. Accessories, spares and quantities are confirmed on the quotation.
MOQ, lead time and packing are confirmed on each quotation for the quantity and delivery destination. Comparators are supplied singly or with shrinkage testing sets for colleges and tender orders.
Frequently asked questions
What does the dial gauge read to?
0.002 mm, over a 5 mm range.
Is a standard bar included?
Yes, a stainless steel standardisation bar with an insulated grip.
Is a digital gauge available?
An electronic dial gauge is optional at extra cost.
Related products
Bar moulds and other shrinkage apparatus are in the Materials range; chemistry apparatus is in the chemistry lab equipment catalogue.
Request a quote
To request a quotation for the Length Comparator, send the quantity and the delivery destination through the JaincoLab contact page or email [email protected], quoting SKU JA-M-8896. For tender or project supply, see our tenders page.
