Timers that keep good time?

I use timers to kick several things on and off during bulk charging, like the water heater, laptop charger, etc.
Unfortunately, all that I have tried keep terrible time, and I have to adjust them once a week or so.
Can anyone recommend a 15 amp capable timer that actually keeps good time?
Unfortunately, all that I have tried keep terrible time, and I have to adjust them once a week or so.
Can anyone recommend a 15 amp capable timer that actually keeps good time?
Comments
Most clocks with 32.768 KHz clock crystals run slow because their designers don't take the couple of pF of PCB runners stray capacitance loading into account. The crystals temp coefficient is an inverted parabola so the farther away from room temp the slower they run.
I have tweeked several clocks by changing their 10-12 pF xtal load capacitors. But you need an accurate timebase to do so.
You miight find one that uses WWVB. Typically named 'atomic' clock.
https://www.amazon.com/Intermatic-WH40-Timer-7-75-inches/dp/B00004W4XI/ref=asc_df_B00004W4XI/
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I have found that there are Digital AC timers that (appear) to use a crystal time base--Usually see something like this:
https://www.amazon.com/Century-Digital-Programmable-Packaging-Security/dp/B00MVF16JG
-Bill