They made many versions of this recorder.  Ours is the one in the photo. We can test it to ensure it works, but there will be no further warranty.  Cables, pens, ink, paper (except for what might be in it already), manuals & calibration are Not included.

Baseline Drift with Time ±0.1% full scale in 24 hours,±0.5% full scale in less than 10 minutes (cold start)
Baseline Drift with Temperature ±0.1% full scale/degree C
Gain Drift with Time ±0.1% full scale in 24 hours
Gain Drift with Temperature ±0.05% full scale/degree C
Non-linearity less than 0.5%
A/D Sample Rate 10 kHz
Lowpass Filter Settings 1, 2, 5, 10, 20, 40, 50, 100, 200, 500Hz and Off
Notch Filter Settings  50, 60 Hz
Filter Response  3dB (±0.5dB) at the selected lowpass frequency, -22dB at the notch frequency
RMS Averaging Time  Slow, medium or fast
Chart Speed Accuracy   ±2%
AC Input Leakage Current  less than 172µA
AC Input Hypot Voltage  1500 Vrms
AC Input Current Draw  Max: 2.15A at 120 VAC, Typical: 0.4A at 120 VAC,
Max: 1.0A at 240 VAC, Typical: 0.24A at 240 VAC
AC Input Min/Max     90-130 VAC at 120 VAC setting;
190-260 VAC on 240VAC setting
DC Input Min/Max  11-20 VDC; 3.0 Amps typical, 5.8 Amps maximum
Battery Charge Time     Greater than 15 Hours
Battery Life   Greater than 1 Hour Nominal; 4.5 Hours at 25 mm/min with 0.5 Hz sine wave input
Operating Temperature   5-40 ¡C
Weight     5.3 lbs. with battery