Any metal thermometer that is designed for that temperature range. Check it's accuracy with boiling water. My digital is 2 degrees low not that that would mean much but they can be off by a lot. No big deal as you know what to add or remember what temp that thermometer works best at plucking. You've got to be 155 F or it's a losing battle. I get the water 155-160 F and dunk, swish, lift and repeat until the largest feathers pull with no effort what so ever.
It doesn't really mater. I have a digital Accurite meat thermometer I'd bought at Wallyworld years ago. Also have a longer analog that came with the turkey fryer and pot combo. I use the Accurite as it's closer to actual temp and shorter and just easy to carry around. I don't even remember the calibration of the analog as it's been so long since I used it. Will need to use it again eventually as the digital is on it's way out. I use it for maple sugaring and it's having a hard time turning on now that its well coated in sticky residue. Lasted me four years now and was only $9. Would have lasted longer if I'd only used it to check meat temp and water. The other will do fine once calibrated again so I know how far off it reads but not as exacting for sugaring. And that doesn't matter anymore as I finally broke down and purchased a syrup hydrometer.
Long story short: I recommend a dirt cheap Accurite digital meat thermometer from Walmart. Calibrate it to boiling water. Looks like they are $10 now.
I have this one: http://www.amazon.com/gp/product/B0...e28b-42c0-a0ea-db9380c6f79b&pf_rd_i=393284011
Don't know how I lived without it! Just used it tonight to measure the temps of my pork chops on the grill. It is fast, durable, accurate and has a range from -40F to 450F. I use this just about every time I grill. And for my chicken water too!