- Johnson Level & Tool JRT300-RDHV-K Self-Leveling Red Dual Slope Rotary Laser Kit, 4,000FT Range, Hard-shell Carry Case, Lithium Ion Batteries, Magnetic Target, Laser Detector, Remote Control

I got this reciver out of necessity I needed one now. So far so good seems good quality and it works with my topcon rl-h4c. I only tested it at 40ft sunny day and it seems very precise. If it doesnt tomorrow I'll write up a follow up. I've been using it for a week. It works well with the topcon and its precise. The within a quarter inch selection is more like within a 1/8". The precise selection is tight real tight. No regrets I'd buy it again the auto shut off is a nice feature and its solid.

Like many shoppers I spent much time on YouTube looking for product reviews. My personal preference came down to this model or a similar one from Bosch both similarly priced. I was thinking of going with Bosch after seeing a video demonstrating how you can distribute the laser in a limited area. However I decided to go with Jonson as I’ve used many of their other products and been happy with them. Other pros: this one comes in a case, the measuring stick is longer than the Bosch package meaning I can use it for basements and deeper water/irrigation lines. Or go to second floor if necessary during construction. After receiving the unit I found it does have a limited distribution option like the Bosch model. It’s super easy to use, the buttons are dummy proof. There aren’t many so if you can’t figure it out you have the option to just mash buttons till you figure it out... it’s that easy. Cons: the case is big. Not something you’d want to keep in your truck for random use if you’re a general contractor. Also the little pieces like the part that connects the laser detector and measuring rod don’t really have a great home in the case. They just get placed where you find room. Biggest Con so far if I had to pick one is the detector. It’s cheaply made and I’ll probably brake it. With that said the main parts are great. Everything else seems like it will last me a lifetime. The level has a thick built in foam case in the plastic case so it should be good for a long time.

Only in use for a few days, so evaluation may change over the next year. Studied reviews of rotary lasers. This unit compares to a Bosch running about the same price and accuracy (+-1/8 in 100') which I consider the minimum usefulness for my purposes. Fortunately the low end price range for +-1/8" in 100' was affordable for my use. Chose this unit because the Johnson has a 3 year warranty, pretty much the units seem comparable otherwise without actually have both in my physical possession for comparison. Slightly cheaper rotary lasers have less accuracy, which I found not acceptable. Some reviews faulted the bottom end Bosch units as having poor longevity of bearings, but the Bosch for comparison is above the bottom end so this wasn't a big factor, Bosch generally has a good line and dot laser rep. Pros: -- seems accurate and stable over 100', accuracy and repeatability being the most important parameters. -- detector 40-6539 (the less expensive of the two detectors of this Johnson type) feels cheap but works well. About +-1/16 error from the detector in my estimation -- detector is loud enough -- spot size about 1/16", pretty constant over 0-30' (used 30' for calibration as recommended). In other words, the spot size did not significantly bloom larger over increasing distances like cheap line and dot lasers. -- tripod seems sturdy Cons: -- poor directions for calibration-- more on that later. Unit arrived with X-axis perfect, Y-axis with 1/8" span (directions say should be no more than 1/16" span). -- case is... huge. I mean, really huge. The design could be a bit more compact.... measure is 51"x9"x15". Foam around the laser head which is good, rest is blow mold with a lot of empty space. Saga of the calibration. The instructions say to set up a 30' range (indoors with dim enough light to see the laser spot), use laser in rotary mode, mark the level for one axis (mark on a wall for instance, where laser line shows), physically rotate head 180*, mark second spot above/below/same location as first spot. The difference in marks should be less than 1/16". X-axis was perfect. Y-axis was 1/8". Rats, need to calibrate. OK... -- the calibration access hole has a plastic philips head plug. Too tight, too soft, my cautionary note is that you need to be very careful removing this plug or the "philips" head will strip out. Being soft, I could jam in a sharp slot head, or use pliers (or Vampliers) to rotate the plug for removal. Now I have a stripped out head in the plug, but the plug is otherwise functional. -- instructions say to use a flat screwdriver to adjust. Really? After much struggling and gentle prodding, I got a really strong flashlight to illuminate the interior through the translucent plastic case to see what the heck was in there. -- you need a 3mm hex, the hex socket head is about 30mm from the case surface (about 60mm-80mm total length if you want to clear the handle; I took the handle off). The adjustment hex socket is straight in there, not offset or anything. Why do they mislead people saying to use a flathead? How likely is it to have a flathead that goes 30mm into the case and manages to fit a hex head? 3mm hex is just really common and cheap. Hint: Johnson you could include this 10 cent part with the kit! Be more like DeWalt! -- the instructions say, after doing the X-axis measurements and calibration (if necessary), to rotate the head 90* and do the Y-axis measurements, then proceed to say which way to rotate the calibration adjustment screw depending on what was observed for an additional 180* rotation... but... what do they mean "90*"? Mathematical 90*? Clockwise, counterclockwise would be more helpful to most folks. I did not bother to keep track just rotated head 90*, measured, then adjusted the hex screw, and if that was the "wrong way" on repeating the 180* check, then I reversed the direction of rotating the adjustment screw. I think most people will do it this way. -- after some false starts, I found that 1 rotation moves the beam about 1/16" give or take. So, a total of 1 rotation set the Y-axis for me, now about 1/32" delta... but it took 20 or 30 iterations tinkering to get, less for you with these hints. -- the proper method for accuracy is to turn off the unit then lock the floating laser element, then insert hex key and adjust, then remove hex key. -- the adjustment is a threaded fastener in the floating laser element. You must lock the head to make this adjustment without potentially causing other problems. By moving the threaded fastener, the center of gravity changes for the floating laser element and the laser beam will shift. The X-axis remained dead on after fumbling through the learning curve to adjust the Y-axis. I wish I had these calibration instruction hints before I started calibration. The hints would have saved me time going up the learning curve, and would have saved me time writing this. Overall the head feels solid, the tripod seems solid, the story pole seems solid, but the detector is somewhat cheap feeling. Accuracy after a short time of using the unit seems sufficient for my purposes. I feel that if you let the head bounce around in the bed of a pickup truck for a lengthy period the calibration will go out as the Y-axis screw I adjusted had relatively little resistance to rotation, so vibration will likely affect calibration. I do not know if the one screw I adjusted is representative of the entire population though. This is a low middle range rotary laser so there are going to be limitations.

We upgraded from an old laser level made about 15 years ago, so we may be a little biased based on how far technology has come, but WOW what an improvement! Everything about this product is top notch, right from the carrying case down to the way the pieces are assembled. This kit is complete and contains everything that you will need to get started, it's exactly what we were looking for. Foremost, the unit is accurate. I mean really dead on accurate. That alone is a great reason to buy this product. Secondly, it really is made out of a durable material. Just holding the laser in your hands you can feel the quality, and on any construction site that is going to go a long way. Lastly, the cost was not bad at all! I honestly would have paid more for this unit. All things considered, 10/10 would buy again!

Replaced the receiver on my old transit. No issues with this one. Helped keep everything level for my massive shop build.

The description states "will work with most red/green rotary laser levels." This is somewhat misleading as one reviewer noted that "the receiver does not work with DeWalt laser levels but works only with all Johnson laser levels." The way Amazon has the reviews listed includes the full Johnson laser level kit and then the laser receiver is subtitled in a conglomerate of all available Johnson options. The reviews need to be separated by each available option rather than the current method of throwing everything together as one category, subtitles or not, or provide a category filter. I do not consider the opinion of just one reviewer sufficient enough to make an informed judgement. The fact that Amazon does not oversee the reviews to insure that the reviews directly pertain to the listed item also makes purchasing decisions difficult. I have taken the time to notate when a review does not pertain to the listed product as sellers manipulate the reviews with comments for other products and not the one being reviewed. Whoever is checking for listing accuracy at Amazon is obviously oblivious to their job description and robbing Amazon of doing job one. Logically, if the product is a battery powered 20 volt tool but the review pertains to the 9 volt model it is obvious that the item and the review are not for the same product. Long story short: Johnson is a great product; however, if you have a Dewalt laser level the Johnson Laser receiver is not compatible with the Dewalt system.

Works as should

This kit has saved us thousands in surveyor costs, and enabled our field supervisor to quickly verify elevations during grading operations. Set up is easy, and the storage case keeps everything organized. The unit also comes with calibration instructions, which will be great moving forward.