Product review (3 stars): Erratic?
This equipment is frustrating.

It is, as the first reviewer said, very easy to get going. Despite caveats in the instructions about situations where the units may not be able to communicate well enough, we have had the full quantity of signal strength bars showing on the main unit display no matter where we place the units, even when the signal has to go between concrete floors and through external concrete walls. Remarkably good. The bar display feature is notably worthwhile.

We have now had the 00611 for about three months.

Initially, the two units agreed with each other out of the package when placed side by side, which is of course how it should be.

However, we have recently had to do this sort of side-by-side test again as the reading from the outdoor unit started getting 'stuck' at an unlikely 98% when humidity was very high, but wouldn't come down, even when brought indoors for a while. [The spec. says that the units' operating range only extends to 95% - so I think '98%' may be a kind of default or error reading. It was a very high humidity day when the 98% problem occurred].

We assumed that the outdoor sensor had become damp and needed time to dry out in order to register lower humidity levels.

The outdoor unit is normally installed in a totally covered location, high on a wall under a four-foot overhang.

The outdoor humidity reading did indeed abruptly start to come down after the unit had a few hours indoors, but stopped when it got within 10% of the indoor reading. (The two units were placed side by side indoors at this time).

With the two units still side by side, we turned on a dehumidifier on the far side of the big room. The outdoor unit reading seemed to get a jolt and soon showed 10% less, not more, than the indoor reading.

But now, as I write, with the dehumidifier having been off for twelve hours, the outdoor unit, still indoors alongside the main unit, registers 71% whereas the indoor reading is 65%. It's all very confusing.

The batteries are Duracell Alkaline and are testing at 1.57 or 1.58 volts.

This cycle of events has actually been repeated, with small variations, a number of times.

There's clearly something going on that I don't understand. It's not certain that there's anything wrong with the units, but maybe the physics (?) of it all are just too much for a consumer-grade product to encompass without these apparent aberrations popping up.