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    Only you know your setup, situation, wants & needs. Prices, features and specs necessary to make an informed choice are provided here and on individual product pages. PLEASE study them carefully.

21st CENTURY TEMPO MANAGEMENT TAKE IT WITH YOU EVERYWHERE AC ADAPTER ELIMINATED   EASY 5 MINUTE UPGRADE!
  Feature  v  /   Device  > Tempo REF mini Tempo REF Beat Bug 3 Beat Bug 2.1
  Tempometer Range 10 - 254 bpm 10 - 250 bpm 10 - 255 bpm 10 - 255 bpm
  Preset Kickoffs (bpm) P1 - P65 (10 - 254) no no no
  Metronome (bpm) P66 (40 - 208) no no no
  Threshold Knob 1 yes yes yes yes
  Sensor Jacks 1 sub mini none 2 mini 2 mini
  Sensors Included int., 1 external internal 1 external use old
  Sources Monitored 2 1 2 2
  Digit Height 0.4" 0.27" 0.56" 0.56"
  Sleep auto & manual auto auto & off auto & off
  Wake On Tap yes yes yes yes
  Rugged ABS Case yes yes yes use old
  Case Dimensions 3.2" x 1.6" x .8" 2.4" x 1.4" x .8" 3.6" x 2.6" x 1.1" 4.5" x 2.6" x .9"
  Snare Mountable anywhere yes too big too big
  Hook & Loop Strips yes yes yes yes
  Batteries Incl. / Life yes / ~1 yr. yes / ~1 yr. yes / ~2 yrs. yes / ~2 yrs.
  A.C. Input no no no no
  Audio Output Jack no no no no
  6 Mo. Warranty yes yes yes yes
  Price                      go to > $100.00 $45.00 $70.00 $40.00

1 ALL have a knob with white line, NO THUMBWHEELS.

Combos

mini Tempo REF

Tempo REF Beat Bug 3
 Tempo REF &       go to > $130.00 -------- --------
 Beat Bug 3 &                > $100.00 $155.00 --------
 Beat Bug 2.1 &             > $75.00 $130.00 $100.00