Four To Twenty User Reviews

Top reviews

Decent app but lacking functionality.

This app is cool but I’m a little confused what the point of the changeable units is. Seems like a “feature” for the sake of having one.

A feature that is needed is the ability to compute values outside of the set range. For example, converting a 3.5mA value to counts on a 4-20mA scale. A lot of troubleshooting involves out of range values.
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Great App!

This app is fantastic!
Wonder what your thoughts are on adding what the 0-100% value would be.
Ex: 0-100•c 16mA would be 75%. This example is very easy but say we’re looking for 42% of the range. Hope this makes sense.

Works well

Quick and easy. It considers all the process variables units. Looks hot. Makes my job so much quicker. Rad.

Response from developer

Thanks for the review!

Simple and easy

I think it would be helpful if you added the math formula with it.

Response from developer

Will look at adding the formula in the next update. Thanks for the feedback

Doesn’t support negative numbers

Doesn’t support negative numbers for differential measurement

Response from developer

Thanks for your review. An update will be coming shortly to fix this

Decent product, needs a little work

Works good as a signal calculator, but need to be able to use negative values for process variables, especially on temperature.

Response from developer

Thanks for the feedback. I'll try to push an update soon that addresses this.

Works for work

Simple and non cluttered interface makes it easy to use. Great for old school analog devices that are adjusted by a POT. Especially if adjustments have to be made with the transmitter in operation and you need to avoid going to minimum or maximum values.

Not necessary but would like to see m3 for level as a units option.
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Response from developer

Thanks for the feedback. I'll add m3/level units in the next version.

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