Testo gauges.

[joeyd]

That is confusing how they wrote it.
So is "±1 Digit" ±1 micron? Thats better than a BluVac
Looks like ±1 digit translates to one tic on their scale which is ±500 microns

Hi, Ice.

Looking at the Testo 557 datasheet, it rates vacuum accuracy as +/- 1% FS (Full Scale) +/- 1 digit (at 22C).

This is a helluva way to rate a micron gauge! I don't know what they consider as "full scale", but, generally, when working with vacuum, I would consider FS to be 760,000 microns. Therefore, 1% FS would be 7,600 microns! In addition, 1 digit, represents 500 microns, as you have indicated.

From my vantage point, then, a reading of +/- 8,100 microns (at any vacuum level and at 22C) would be within factory spec. And no specs are given outside of the 22C temperature point. TIFWIW!

Full disclosure for those who don't know: I am the inventer, designer, and manufacturer of the AccuTools BluVac & BluVac LTE gauges.

Edit: Upon further reading of the datasheet, the vacuum range is 0 to 1 bar. So, one bar, or 750,064 microns, should be "full scale".

[eddiegoodfellar]

what is the accuracy of the bluvac?

[Itstony]

I'm getting a Testo anyway. Just deciding on which vacuum gauge.
The fieldpiece look good value at $126.

[itsiceman]

I'm getting a Testo anyway. Just deciding on which vacuum gauge.
The fieldpiece look good value at $126.

IMO Stick with the vacuum indicator in the testo gauge till you can afford anything but the very best micron gauge like a Thermal or BluVac. Anything else will be a headache

[Itstony]

IMO Stick with the vacuum indicator in the testo gauge till you can afford anything but the very best micron gauge like a Thermal or BluVac. Anything else will be a headache

OK, I will go for the BluVac lite. Just waiting for Jim from Trutech to get back to me.

[joeyd]

what is the accuracy of the bluvac?

The BluVacs' rated accuracy is +/- 5% (of reading) +/- 5 microns from 10°F to 122°F (-12°C to 50°C).

Additionally, the BluVacs can be recalibrated to factory specifications simply by placing it in your freezer. No return to factory necessary for calibration.

[eddiegoodfellar]

So if we are sitting at 1000 microns on the Bluvac

It would be in the 1045 micron to 945 micron range?

[Itstony]

So if we are sitting at 1000 microns on the Bluvac

It would be in the 1045 micron to 945 micron range?

It would be good eddie if anybody that uses the 557/570 along with a stand alone vac-gauge could contribute.
Your statement may be tongue in cheek, but that is exactlty what Testo's spec sheet says.
For HVAC it makes me wonder if this feature is "Showing us what we could have won".

[eddiegoodfellar]

No tongue in cheek intended. I have been tricked in the past with accuracy,scale,resolution and count on meters before.

**I should have wrote 1055microns not 1045microns

[joeyd]

So if we are sitting at 1000 microns on the Bluvac

It would be in the 1045 micron to 945 micron range?

As you indicated in your correction above, 945 to 1055.

[eddiegoodfellar]

Thank you.

[joeyd]

So if we are sitting at 1000 microns on the Bluvac

It would be in the 1045 micron to 945 micron range?

As you indicated in your correction above, 945 to 1055.