DAVTRON MODEL 655, Aircraft Spruce and others

[DAVIDWH]

Offers single push button for density altitude digital display read out. 

 

Doesn't stop those long takeoff and landing rolls, (On hot days, high altitudes and over gross) 

 

but at least you know they're in front of you.

[N601RX]

It works well.  I put one in a couple of years ago. 

[KSMooniac]

I've had one for several years and really like it.

[jetdriven]

I did the Davtron M830, timer, flight timer, local and ZT, plus OAT and volts

[KSMooniac]

That is a good one too, Byron.  In my case my plane already had an m811b clock/timer so I added the 655 when my OAT quit working.