Eureka	YSI - 650MDS	Hydrolab Surveyor 4a
View live data	YES	YES	YES
Calibrate instruments	YES	YES	YES
Download data from probes	YES	YES	YES
Set up logging runs	YES	YES	YES
Rugged design case with high-impact resistance	YES	YES	YES
Lifetime warranty on case	YES	—	—
Rolling data	YES	—	—
Optional GPS	YES	YES	YES
Optional barometer	—	YES	YES
Optional bar code scanner	YES	—	—
Floating case	YES	—	—
Pocket PC Platform	YES	—	—
Intel x-scale processor	YES	—	—
Built-in stats	YES	—	—
Store hundreds of files	YES	—	—
Maximum data memory	1GB	1.5MB	1.5MB
Battery life	20+ hrs	30+ hrs	12-16 hrs
Use with Hydrolab, YSI and Eureka instruments	YES	—	—
Auto-sync to PC	YES	—	—
Attach notes	YES	YES	—
Annotation	YES	YES	—
Attach drawings	YES	—	—
Attach pictures	YES	—	—
Record average readings	YES	—	—
One-button logging	YES	—	—
Green Light/Red Light indicator	YES	—	—
Color Display	YES	—	—
Price	$1295 with HP iPAQ 2190	$1350-2500	$1500-2150