Weems & Plath Aluminum Arm Parallel Ruler - various lengths
Weems & Plath Aluminum Arm Parallel Ruler - various lengths additional 1Weems & Plath Aluminum Arm Parallel Ruler - various lengths additional 2

£19.19 inc VAT

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Weems and Plath’s 18” Aluminium Arm Parallel ruler has been manufactured to a ¼” thickness, with an 18” length. A navigational instrument that boasts high-quality construction, it’s naturally provided with a lifetime warranty.

A essential for any navigators tool kit, this aluminium parallel ruler can be used to plot out your course on a nautical chart, with a set of two straight edged that are hinged together in order to keep a consistent angle. As you slowly alternate the moving egde, whilst firmly holding down the non-moving edge, the aluminium parallel ruler can be moved around the chart whilst the angle remains unchanged.

Product Code:

Customer Reviews 5.0 5 5.0/5 Based on 6 reviews Show all reviews


Good value Reviewed by Jones.wyn on 16 Nov 2019

A really handy piece of navigation kit


Parallel /Ruler Reviewed by Ballum.mac on 28 Aug 2019

I was really pleasantly surprised when I opened my Parallel Rulers to find they were extremely well made and very solid. I happen not to be using them to chart with but use them as drawing implements. Very happy and recommend to anyone.


Excellent service. Reviewed by Terry.maloney on 05 Aug 2019

Pleased with my purchases. Would not hesitate to recommend Mylor Chandlery. First rate service.


Very fast turn around. Product well packed and protected. Reviewed by Peter M Hemming on 08 Jul 2019

My purpose in acquiring this product was to help me with academic geometry and with engineering drawing. I chose the 12" length as being more portable and accurate enough. Surprisingly, the UK, traditionally a nation of seafarers, has not produced a decent parallel bar ruler. A product of this sort is so useful that the makers of school maths sets should include a smaller version of one of these. I have an idea for improving the utility of the product and I hope to mail you a drawing.


Quality Equipment-Competitively Priced Reviewed by HeleneLD on 13 Jun 2019

Quality equipment, using for RYA Navigation Course. Website was easy to use and simple to place order. Arrived in a few days, as stated and securely packaged.


Mainland UK Delivery

Delivery Option Delivery Time Tracked Signed For Cost
Standard Delivery (Orders Under £100) 2-3 Working Days No No 3.25
All Standard Orders Over £100 2-3 Working Days Yes Yes FREE
Express Delivery Next Working Day Yes Yes £12.95

Delivery Surcharges: Liquids, Paint & Gas

(Flares UK Mainland Only)

1-2 Working Days Yes Yes £3.50
Delivery Surcharges: Flares (UK Mainland Only) 1-2 Working Days Yes Yes £35

European Delivery (EU Countries Only)

Delivery Option Delivery Time Tracked Signed For Cost
EU Standard Delivery (Orders under £30) 5-10 Working Days No No £10.00
EU Standard Delivery (Orders £30-£100) 5-7 Working Days No Yes £15.00
EU Standard Delivery (Orders Over £100) 2-5 Working Days Yes Yes £22.50

Rest of the World Delivery Rates

Delivery Option Delivery Time Tracked Signed For Cost
RoW Delivery (Orders under £30) 10-14 Working Days No No £10.00
RoW Delivery (Orders over £30 - £100) 5-7 Working Days No Yes £15.00
RoW Delivery (Over £100) 2-5 Working Days Yes Yes £25.00

Non-Mainland UK and International Delivery

We are able to process orders from non-mainland UK addresses, including the Scottish Highlands and Islands, Ireland and the Channel Islands.

How quickly will my order arrive?

Our aim is to dispatch all orders placed before 12 noon on the same day. Any orders placed after that time will be dispatched on the next available working day.

We will send you a notification email when your order has been dispatched. The time your order takes to arrive will depend on the delivery option you have choosen.

Whilst we try our best to dispatch every order following the above guidelines, during extremely busy periods, dispatch times may increase by up to one day.

How can I track the status of my order?

You will receive an email to confirm we have received your order and that your payment has been accepted. You will also receive an email when your order has been dispatched.

In your dispatch confirmation email we will include any relevant tracking numbers, allowing you to track your parcel on either the Interlink/Royal Mail/UPS website. You will only receive a tracking number if you have chosen a tracked delivery option for your order.



All orders are thoroughly checked before leaving our premises. On receipt of your order we request that you check the items as soon as possible. If you are unhappy with your order for any reason, please contact us immediately on 01326 375 482 or support@mylorchandlery.co.uk. Please have your order number to hand when you contact us as it will allow us to find your order quickly.

If you are unsatisfied with your order in any way, please return it to us within 14 days of delivery for a refund or exchange. The item must be unused, be in its original packaging and be suitable for re-sale. Items bought in the sale are non-returnable and non-refundable. Postage costs for returning items to us can only be refunded if the item is faulty or damaged.

We recommend that you send your order back to us by obtaining a ‘proof of posting’ (free at all Post Offices) or alternatively using a tracked delivery service. Please note we cannot be held responsible for any parcel lost during transit to us. 

Our return address is:

Web Returns
Mylor Chandlery Ltd 
Mylor Yacht Harbour
TR11 5UF

Once your item has been returned, we will inspect it and take the necessary action as soon as possible.

Faulty/Damaged Goods

If any item you receive arrives damaged, please contact us as soon as possible on 01326 375 482 or by email support@mylorchandlery.co.uk.  We will then advise you on the best course of action. 

In most cases we will ask you to return the item to us for an exchange or refund. Unfortunately we can only refund your postage costs when you return an item to us that is faulty.

Please do not return a damaged order to us without contacting us first.