Ramesh's Measure Guard

Before you cut rope or a metal rod to length, point your phone at it and let the app check the measurement, so nothing short goes across the counter.

Who this is for

Ramesh Tandel runs a hardware shop on the main road in Kalyan, Maharashtra. Two counters, himself and one helper, Sagar. On a Saturday morning eleven people are waiting and a painter asks for eighteen feet of nylon rope. Ramesh pulls it along the counter, eyes the tape, chalks a mark and cuts. The painter unrolls it at home and it is sixteen and a half. He comes back on Monday, unhappy, and Ramesh hands over the difference free.

How the job is done today

A steel measuring tape is screwed along the front edge of the counter, from before Ramesh took over the shop. He lays the rope on it, holds his thumb at the mark, chalks it and cuts. For TMT bars, Sagar counts the marks by hand and cuts with the wheel. Nobody writes down what was cut. When a customer comes back saying it is short, there is no way to know whether the cut was short or the man measured his wall wrong, so Ramesh gives extra and takes the loss. The bad pieces go into a bin under the counter and get sold cheap, or not at all.

The screens, in order

1. Teach it your counter — A one-time setup where the shop shows the app the fixed mark on its own counter edge, so every reading afterwards is against a length the shopkeeper already trusts.
2. What was asked for — The shopkeeper taps the material and types the length the customer asked for, before touching the cutter.
3. Point and check — The camera view over the counter where the piece is lying, showing the measured length while the shopkeeper still has the chalk in his hand.
4. The flag — A quiet card that appears only when the piece is outside the slack allowed for that material, saying how much short or long it is.
5. Day's cuts — The evening list of what was asked for and what was actually measured, so a customer's complaint on Monday can be answered instead of paid for.
6. Materials — Where the shop sets which items it cuts and how much slack is acceptable on each, because rope forgives half an inch and a curtain rod does not.

What it keeps track of

• Cuts — which day and time, what material, length asked for, length the phone measured, whether it was cut or re-measured, who was at the counter
• Materials — name of the item, sold by feet or metres, how much shorter or longer is still acceptable
• Counter setup — which shop, which counter, the known mark it measures against, when it was last checked
• Shops — shop name and town, who runs it, which phones are in use, paid till which month

The one decision that matters

The real choice is what happens the moment a reading is wrong. One way, the app interrupts: a sound, a red screen, cutting blocked until someone taps to confirm. The other way, it stays quiet: the number simply sits on screen and a flag appears only past the slack, with no sound at all. Go quiet. A customer is standing across the counter watching the shopkeeper's face. A beeping phone tells that customer the shop cannot be trusted with a piece of rope, and by the third beep on a busy Saturday Ramesh turns the app off and never turns it back on. The phone is propped facing the shopkeeper, not the customer, and it corrects him without announcing that he needed correcting.

What to leave out of the first version

Leave out billing, price per foot, and stock counting. Every hardware shop already has a way of taking money and none of them want a second one at the counter. The whole product rests on one thing being true: the number on the screen matches the tape screwed to the counter. If it is wrong even twice, Ramesh stops looking at the phone and no amount of billing built on top will bring him back. Spend the first version entirely on the measurement being right on rope, pipe and bars lying flat.

How you would know it worked

Two weeks in, the bin of wrongly cut off-cuts under Ramesh's counter has not filled up again, and Sagar stops walking over to ask Ramesh to double-check a length before he cuts it.

Build it

Paste this in and let it run.

I run a hardware shop and all day we cut nylon rope, PVC pipe and TMT bars to length at the counter. I want a phone app that I stand up on the counter facing me, where I first pick the material and type what the customer asked for, say eighteen feet, then point the camera at the piece lying along my counter and it shows me the length before I cut. There is a fixed mark on my counter edge it can measure against, and I want to set that up once at the start. If the piece is off by more than the slack I have allowed for that material, show me a clear flag on my side, but with no sound, because the customer is standing right in front of me. Keep a simple list of the day's cuts, what was asked for and what was measured. Later I want to sell this to other hardware shops, so each shop should be able to set up its own counter, its own materials and pay me monthly.